parser.y

%{
// Copyright 2013 The ql Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSES/QL-LICENSE file.

// Copyright 2015 PingCAP, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// See the License for the specific language governing permissions and
// limitations under the License.

// Initial yacc source generated by ebnf2y[1]
// at 2013-10-04 23:10:47.861401015 +0200 CEST
//
//  $ ebnf2y -o ql.y -oe ql.ebnf -start StatementList -pkg ql -p _
//
//   [1]: http://github.com/cznic/ebnf2y

package parser

import (
	"strings"

	"github.com/pingcap/parser/mysql"
	"github.com/pingcap/parser/ast"
	"github.com/pingcap/parser/model"
	"github.com/pingcap/parser/opcode"
	"github.com/pingcap/parser/auth"
	"github.com/pingcap/parser/charset"
	"github.com/pingcap/parser/types"
)

%}

%union {
	offset int // offset
	item interface{}
	ident string
	expr ast.ExprNode
	statement ast.StmtNode
}

%token	<ident>

	/*yy:token "%c"     */
	identifier "identifier"

	/*yy:token "_%c"    */
	underscoreCS "UNDERSCORE_CHARSET"

	/*yy:token "\"%c\"" */
	stringLit          "string literal"
	singleAtIdentifier "identifier with single leading at"
	doubleAtIdentifier "identifier with double leading at"
	invalid            "a special token never used by parser, used by lexer to indicate error"
	hintComment        "an optimizer hint"
	andand             "&&"
	pipes              "||"

	/* The following tokens belong to ODBCDateTimeType. */
	odbcDateType      "d"
	odbcTimeType      "t"
	odbcTimestampType "ts"

	/* The following tokens belong to ReservedKeyword. Notice: make sure these tokens are contained in ReservedKeyword. */
	add               "ADD"
	all               "ALL"
	alter             "ALTER"
	analyze           "ANALYZE"
	and               "AND"
	as                "AS"
	asc               "ASC"
	between           "BETWEEN"
	bigIntType        "BIGINT"
	binaryType        "BINARY"
	blobType          "BLOB"
	both              "BOTH"
	by                "BY"
	call              "CALL"
	cascade           "CASCADE"
	caseKwd           "CASE"
	change            "CHANGE"
	character         "CHARACTER"
	charType          "CHAR"
	check             "CHECK"
	collate           "COLLATE"
	column            "COLUMN"
	constraint        "CONSTRAINT"
	convert           "CONVERT"
	create            "CREATE"
	cross             "CROSS"
	cumeDist          "CUME_DIST"
	currentDate       "CURRENT_DATE"
	currentTime       "CURRENT_TIME"
	currentTs         "CURRENT_TIMESTAMP"
	currentUser       "CURRENT_USER"
	currentRole       "CURRENT_ROLE"
	database          "DATABASE"
	databases         "DATABASES"
	dayHour           "DAY_HOUR"
	dayMicrosecond    "DAY_MICROSECOND"
	dayMinute         "DAY_MINUTE"
	daySecond         "DAY_SECOND"
	decimalType       "DECIMAL"
	defaultKwd        "DEFAULT"
	delayed           "DELAYED"
	deleteKwd         "DELETE"
	denseRank         "DENSE_RANK"
	desc              "DESC"
	describe          "DESCRIBE"
	distinct          "DISTINCT"
	distinctRow       "DISTINCTROW"
	div               "DIV"
	doubleType        "DOUBLE"
	drop              "DROP"
	dual              "DUAL"
	elseKwd           "ELSE"
	enclosed          "ENCLOSED"
	escaped           "ESCAPED"
	exists            "EXISTS"
	explain           "EXPLAIN"
	except            "EXCEPT"
	falseKwd          "FALSE"
	fetch             "FETCH"
	firstValue        "FIRST_VALUE"
	floatType         "FLOAT"
	forKwd            "FOR"
	force             "FORCE"
	foreign           "FOREIGN"
	from              "FROM"
	fulltext          "FULLTEXT"
	generated         "GENERATED"
	grant             "GRANT"
	group             "GROUP"
	groups            "GROUPS"
	having            "HAVING"
	highPriority      "HIGH_PRIORITY"
	hourMicrosecond   "HOUR_MICROSECOND"
	hourMinute        "HOUR_MINUTE"
	hourSecond        "HOUR_SECOND"
	ifKwd             "IF"
	ignore            "IGNORE"
	in                "IN"
	index             "INDEX"
	infile            "INFILE"
	inner             "INNER"
	integerType       "INTEGER"
	intersect         "INTERSECT"
	interval          "INTERVAL"
	into              "INTO"
	outfile           "OUTFILE"
	is                "IS"
	insert            "INSERT"
	intType           "INT"
	int1Type          "INT1"
	int2Type          "INT2"
	int3Type          "INT3"
	int4Type          "INT4"
	int8Type          "INT8"
	join              "JOIN"
	key               "KEY"
	keys              "KEYS"
	kill              "KILL"
	lag               "LAG"
	lastValue         "LAST_VALUE"
	lead              "LEAD"
	leading           "LEADING"
	left              "LEFT"
	like              "LIKE"
	limit             "LIMIT"
	lines             "LINES"
	linear            "LINEAR"
	load              "LOAD"
	localTime         "LOCALTIME"
	localTs           "LOCALTIMESTAMP"
	lock              "LOCK"
	longblobType      "LONGBLOB"
	longtextType      "LONGTEXT"
	lowPriority       "LOW_PRIORITY"
	match             "MATCH"
	maxValue          "MAXVALUE"
	mediumblobType    "MEDIUMBLOB"
	mediumIntType     "MEDIUMINT"
	mediumtextType    "MEDIUMTEXT"
	minuteMicrosecond "MINUTE_MICROSECOND"
	minuteSecond      "MINUTE_SECOND"
	mod               "MOD"
	not               "NOT"
	noWriteToBinLog   "NO_WRITE_TO_BINLOG"
	nthValue          "NTH_VALUE"
	ntile             "NTILE"
	null              "NULL"
	numericType       "NUMERIC"
	on                "ON"
	optimize          "OPTIMIZE"
	option            "OPTION"
	optionally        "OPTIONALLY"
	or                "OR"
	order             "ORDER"
	outer             "OUTER"
	over              "OVER"
	partition         "PARTITION"
	percentRank       "PERCENT_RANK"
	placement         "PLACEMENT"
	precisionType     "PRECISION"
	primary           "PRIMARY"
	procedure         "PROCEDURE"
	rangeKwd          "RANGE"
	rank              "RANK"
	read              "READ"
	realType          "REAL"
	references        "REFERENCES"
	regexpKwd         "REGEXP"
	release           "RELEASE"
	rename            "RENAME"
	repeat            "REPEAT"
	replace           "REPLACE"
	require           "REQUIRE"
	restrict          "RESTRICT"
	revoke            "REVOKE"
	right             "RIGHT"
	rlike             "RLIKE"
	row               "ROW"
	rows              "ROWS"
	rowNumber         "ROW_NUMBER"
	secondMicrosecond "SECOND_MICROSECOND"
	selectKwd         "SELECT"
	set               "SET"
	show              "SHOW"
	smallIntType      "SMALLINT"
	spatial           "SPATIAL"
	sql               "SQL"
	sqlBigResult      "SQL_BIG_RESULT"
	sqlCalcFoundRows  "SQL_CALC_FOUND_ROWS"
	sqlSmallResult    "SQL_SMALL_RESULT"
	ssl               "SSL"
	starting          "STARTING"
	straightJoin      "STRAIGHT_JOIN"
	tableKwd          "TABLE"
	tableSample       "TABLESAMPLE"
	stored            "STORED"
	terminated        "TERMINATED"
	then              "THEN"
	tidbStats         "TIDB_STATS"
	tinyblobType      "TINYBLOB"
	tinyIntType       "TINYINT"
	tinytextType      "TINYTEXT"
	to                "TO"
	trailing          "TRAILING"
	trigger           "TRIGGER"
	trueKwd           "TRUE"
	unique            "UNIQUE"
	union             "UNION"
	unlock            "UNLOCK"
	unsigned          "UNSIGNED"
	update            "UPDATE"
	usage             "USAGE"
	use               "USE"
	using             "USING"
	utcDate           "UTC_DATE"
	utcTimestamp      "UTC_TIMESTAMP"
	utcTime           "UTC_TIME"
	values            "VALUES"
	long              "LONG"
	varcharType       "VARCHAR"
	varcharacter      "VARCHARACTER"
	varbinaryType     "VARBINARY"
	varying           "VARYING"
	virtual           "VIRTUAL"
	when              "WHEN"
	where             "WHERE"
	traverse          "TRAVERSE"
	write             "WRITE"
	window            "WINDOW"
	with              "WITH"
	xor               "XOR"
	yearMonth         "YEAR_MONTH"
	zerofill          "ZEROFILL"
	natural           "NATURAL"

	/* The following tokens belong to UnReservedKeyword. Notice: make sure these tokens are contained in UnReservedKeyword. */
	account               "ACCOUNT"
	action                "ACTION"
	advise                "ADVISE"
	after                 "AFTER"
	against               "AGAINST"
	ago                   "AGO"
	algorithm             "ALGORITHM"
	always                "ALWAYS"
	any                   "ANY"
	ascii                 "ASCII"
	autoIdCache           "AUTO_ID_CACHE"
	autoIncrement         "AUTO_INCREMENT"
	autoRandom            "AUTO_RANDOM"
	autoRandomBase        "AUTO_RANDOM_BASE"
	avg                   "AVG"
	avgRowLength          "AVG_ROW_LENGTH"
	backend               "BACKEND"
	backup                "BACKUP"
	backups               "BACKUPS"
	begin                 "BEGIN"
	bernoulli             "BERNOULLI"
	binding               "BINDING"
	bindings              "BINDINGS"
	binlog                "BINLOG"
	bitType               "BIT"
	block                 "BLOCK"
	booleanType           "BOOLEAN"
	boolType              "BOOL"
	btree                 "BTREE"
	byteType              "BYTE"
	cache                 "CACHE"
	capture               "CAPTURE"
	cascaded              "CASCADED"
	chain                 "CHAIN"
	charsetKwd            "CHARSET"
	checkpoint            "CHECKPOINT"
	checksum              "CHECKSUM"
	cipher                "CIPHER"
	cleanup               "CLEANUP"
	client                "CLIENT"
	coalesce              "COALESCE"
	collation             "COLLATION"
	columnFormat          "COLUMN_FORMAT"
	columns               "COLUMNS"
	config                "CONFIG"
	comment               "COMMENT"
	commit                "COMMIT"
	committed             "COMMITTED"
	compact               "COMPACT"
	compressed            "COMPRESSED"
	compression           "COMPRESSION"
	concurrency           "CONCURRENCY"
	connection            "CONNECTION"
	consistent            "CONSISTENT"
	constraints           "CONSTRAINTS"
	context               "CONTEXT"
	cpu                   "CPU"
	csvBackslashEscape    "CSV_BACKSLASH_ESCAPE"
	csvDelimiter          "CSV_DELIMITER"
	csvHeader             "CSV_HEADER"
	csvNotNull            "CSV_NOT_NULL"
	csvNull               "CSV_NULL"
	csvSeparator          "CSV_SEPARATOR"
	csvTrimLastSeparators "CSV_TRIM_LAST_SEPARATORS"
	current               "CURRENT"
	cycle                 "CYCLE"
	data                  "DATA"
	datetimeType          "DATETIME"
	dateType              "DATE"
	day                   "DAY"
	deallocate            "DEALLOCATE"
	definer               "DEFINER"
	delayKeyWrite         "DELAY_KEY_WRITE"
	directory             "DIRECTORY"
	disable               "DISABLE"
	discard               "DISCARD"
	disk                  "DISK"
	do                    "DO"
	duplicate             "DUPLICATE"
	dynamic               "DYNAMIC"
	enable                "ENABLE"
	encryption            "ENCRYPTION"
	end                   "END"
	enforced              "ENFORCED"
	engine                "ENGINE"
	engines               "ENGINES"
	enum                  "ENUM"
	errorKwd              "ERROR"
	escape                "ESCAPE"
	event                 "EVENT"
	events                "EVENTS"
	evolve                "EVOLVE"
	exchange              "EXCHANGE"
	exclusive             "EXCLUSIVE"
	execute               "EXECUTE"
	expansion             "EXPANSION"
	expire                "EXPIRE"
	extended              "EXTENDED"
	faultsSym             "FAULTS"
	fields                "FIELDS"
	file                  "FILE"
	first                 "FIRST"
	fixed                 "FIXED"
	flush                 "FLUSH"
	following             "FOLLOWING"
	format                "FORMAT"
	full                  "FULL"
	function              "FUNCTION"
	general               "GENERAL"
	global                "GLOBAL"
	grants                "GRANTS"
	hash                  "HASH"
	histogram             "HISTOGRAM"
	history               "HISTORY"
	hosts                 "HOSTS"
	hour                  "HOUR"
	identified            "IDENTIFIED"
	identSQLErrors        "ERRORS"
	importKwd             "IMPORT"
	imports               "IMPORTS"
	increment             "INCREMENT"
	incremental           "INCREMENTAL"
	indexes               "INDEXES"
	insertMethod          "INSERT_METHOD"
	instance              "INSTANCE"
	invisible             "INVISIBLE"
	invoker               "INVOKER"
	io                    "IO"
	ipc                   "IPC"
	isolation             "ISOLATION"
	issuer                "ISSUER"
	jsonType              "JSON"
	keyBlockSize          "KEY_BLOCK_SIZE"
	labels                "LABELS"
	language              "LANGUAGE"
	last                  "LAST"
	lastBackup            "LAST_BACKUP"
	lastval               "LASTVAL"
	less                  "LESS"
	level                 "LEVEL"
	list                  "LIST"
	local                 "LOCAL"
	locked                "LOCKED"
	location              "LOCATION"
	logs                  "LOGS"
	master                "MASTER"
	max_idxnum            "MAX_IDXNUM"
	max_minutes           "MAX_MINUTES"
	maxConnectionsPerHour "MAX_CONNECTIONS_PER_HOUR"
	maxQueriesPerHour     "MAX_QUERIES_PER_HOUR"
	maxRows               "MAX_ROWS"
	maxUpdatesPerHour     "MAX_UPDATES_PER_HOUR"
	maxUserConnections    "MAX_USER_CONNECTIONS"
	mb                    "MB"
	memory                "MEMORY"
	merge                 "MERGE"
	microsecond           "MICROSECOND"
	minRows               "MIN_ROWS"
	minute                "MINUTE"
	minValue              "MINVALUE"
	mode                  "MODE"
	modify                "MODIFY"
	month                 "MONTH"
	names                 "NAMES"
	national              "NATIONAL"
	ncharType             "NCHAR"
	never                 "NEVER"
	next                  "NEXT"
	nextval               "NEXTVAL"
	no                    "NO"
	nocache               "NOCACHE"
	nocycle               "NOCYCLE"
	nodegroup             "NODEGROUP"
	nomaxvalue            "NOMAXVALUE"
	nominvalue            "NOMINVALUE"
	none                  "NONE"
	nowait                "NOWAIT"
	nvarcharType          "NVARCHAR"
	nulls                 "NULLS"
	off                   "OFF"
	offset                "OFFSET"
	onDuplicate           "ON_DUPLICATE"
	online                "ONLINE"
	only                  "ONLY"
	open                  "OPEN"
	optional              "OPTIONAL"
	packKeys              "PACK_KEYS"
	pageSym               "PAGE"
	parser                "PARSER"
	partial               "PARTIAL"
	partitioning          "PARTITIONING"
	partitions            "PARTITIONS"
	password              "PASSWORD"
	percent               "PERCENT"
	per_db                "PER_DB"
	per_table             "PER_TABLE"
	pipesAsOr
	plugins               "PLUGINS"
	policy                "POLICY"
	preSplitRegions       "PRE_SPLIT_REGIONS"
	preceding             "PRECEDING"
	prepare               "PREPARE"
	privileges            "PRIVILEGES"
	process               "PROCESS"
	processlist           "PROCESSLIST"
	profile               "PROFILE"
	profiles              "PROFILES"
	proxy                 "PROXY"
	purge                 "PURGE"
	quarter               "QUARTER"
	queries               "QUERIES"
	query                 "QUERY"
	quick                 "QUICK"
	rateLimit             "RATE_LIMIT"
	rebuild               "REBUILD"
	recover               "RECOVER"
	redundant             "REDUNDANT"
	reload                "RELOAD"
	remove                "REMOVE"
	reorganize            "REORGANIZE"
	repair                "REPAIR"
	repeatable            "REPEATABLE"
	replica               "REPLICA"
	replicas              "REPLICAS"
	replication           "REPLICATION"
	required              "REQUIRED"
	respect               "RESPECT"
	restart               "RESTART"
	restore               "RESTORE"
	restores              "RESTORES"
	resume                "RESUME"
	reverse               "REVERSE"
	role                  "ROLE"
	rollback              "ROLLBACK"
	routine               "ROUTINE"
	rowCount              "ROW_COUNT"
	rowFormat             "ROW_FORMAT"
	rtree                 "RTREE"
	san                   "SAN"
	second                "SECOND"
	secondaryEngine       "SECONDARY_ENGINE"
	secondaryLoad         "SECONDARY_LOAD"
	secondaryUnload       "SECONDARY_UNLOAD"
	security              "SECURITY"
	sendCredentialsToTiKV "SEND_CREDENTIALS_TO_TIKV"
	separator             "SEPARATOR"
	sequence              "SEQUENCE"
	serial                "SERIAL"
	serializable          "SERIALIZABLE"
	session               "SESSION"
	setval                "SETVAL"
	shardRowIDBits        "SHARD_ROW_ID_BITS"
	share                 "SHARE"
	shared                "SHARED"
	shutdown              "SHUTDOWN"
	signed                "SIGNED"
	simple                "SIMPLE"
	skip                  "SKIP"
	skipSchemaFiles       "SKIP_SCHEMA_FILES"
	slave                 "SLAVE"
	slow                  "SLOW"
	snapshot              "SNAPSHOT"
	some                  "SOME"
	source                "SOURCE"
	sqlBufferResult       "SQL_BUFFER_RESULT"
	sqlCache              "SQL_CACHE"
	sqlNoCache            "SQL_NO_CACHE"
	sqlTsiDay             "SQL_TSI_DAY"
	sqlTsiHour            "SQL_TSI_HOUR"
	sqlTsiMinute          "SQL_TSI_MINUTE"
	sqlTsiMonth           "SQL_TSI_MONTH"
	sqlTsiQuarter         "SQL_TSI_QUARTER"
	sqlTsiSecond          "SQL_TSI_SECOND"
	sqlTsiWeek            "SQL_TSI_WEEK"
	sqlTsiYear            "SQL_TSI_YEAR"
	start                 "START"
	statsAutoRecalc       "STATS_AUTO_RECALC"
	statsPersistent       "STATS_PERSISTENT"
	statsSamplePages      "STATS_SAMPLE_PAGES"
	status                "STATUS"
	storage               "STORAGE"
	strictFormat          "STRICT_FORMAT"
	subject               "SUBJECT"
	subpartition          "SUBPARTITION"
	subpartitions         "SUBPARTITIONS"
	super                 "SUPER"
	swaps                 "SWAPS"
	switchesSym           "SWITCHES"
	system                "SYSTEM"
	systemTime            "SYSTEM_TIME"
	tableChecksum         "TABLE_CHECKSUM"
	tables                "TABLES"
	tablespace            "TABLESPACE"
	temporary             "TEMPORARY"
	temptable             "TEMPTABLE"
	textType              "TEXT"
	than                  "THAN"
	tikvImporter          "TIKV_IMPORTER"
	timestampType         "TIMESTAMP"
	timeType              "TIME"
	tp                    "TYPE"
	trace                 "TRACE"
	traditional           "TRADITIONAL"
	transaction           "TRANSACTION"
	triggers              "TRIGGERS"
	truncate              "TRUNCATE"
	unbounded             "UNBOUNDED"
	uncommitted           "UNCOMMITTED"
	undefined             "UNDEFINED"
	unicodeSym            "UNICODE"
	unknown               "UNKNOWN"
	user                  "USER"
	validation            "VALIDATION"
	value                 "VALUE"
	variables             "VARIABLES"
	view                  "VIEW"
	visible               "VISIBLE"
	warnings              "WARNINGS"
	week                  "WEEK"
	weightString          "WEIGHT_STRING"
	without               "WITHOUT"
	x509                  "X509"
	yearType              "YEAR"
	wait                  "WAIT"

	/* The following tokens belong to NotKeywordToken. Notice: make sure these tokens are contained in NotKeywordToken. */
	addDate               "ADDDATE"
	approxCountDistinct   "APPROX_COUNT_DISTINCT"
	approxPercentile      "APPROX_PERCENTILE"
	bitAnd                "BIT_AND"
	bitOr                 "BIT_OR"
	bitXor                "BIT_XOR"
	bound                 "BOUND"
	cast                  "CAST"
	copyKwd               "COPY"
	curTime               "CURTIME"
	dateAdd               "DATE_ADD"
	dateSub               "DATE_SUB"
	exact                 "EXACT"
	extract               "EXTRACT"
	flashback             "FLASHBACK"
	getFormat             "GET_FORMAT"
	groupConcat           "GROUP_CONCAT"
	next_row_id           "NEXT_ROW_ID"
	inplace               "INPLACE"
	instant               "INSTANT"
	internal              "INTERNAL"
	min                   "MIN"
	max                   "MAX"
	now                   "NOW"
	position              "POSITION"
	recent                "RECENT"
	s3                    "S3"
	staleness             "STALENESS"
	std                   "STD"
	stddev                "STDDEV"
	stddevPop             "STDDEV_POP"
	stddevSamp            "STDDEV_SAMP"
	strong                "STRONG"
	subDate               "SUBDATE"
	sum                   "SUM"
	substring             "SUBSTRING"
	timestampAdd          "TIMESTAMPADD"
	timestampDiff         "TIMESTAMPDIFF"
	tokudbDefault         "TOKUDB_DEFAULT"
	tokudbFast            "TOKUDB_FAST"
	tokudbLzma            "TOKUDB_LZMA"
	tokudbQuickLZ         "TOKUDB_QUICKLZ"
	tokudbSnappy          "TOKUDB_SNAPPY"
	tokudbSmall           "TOKUDB_SMALL"
	tokudbUncompressed    "TOKUDB_UNCOMPRESSED"
	tokudbZlib            "TOKUDB_ZLIB"
	top                   "TOP"
	trim                  "TRIM"
	variance              "VARIANCE"
	varPop                "VAR_POP"
	varSamp               "VAR_SAMP"
	exprPushdownBlacklist "EXPR_PUSHDOWN_BLACKLIST"
	optRuleBlacklist      "OPT_RULE_BLACKLIST"
	jsonArrayagg          "JSON_ARRAYAGG"
	jsonObjectAgg         "JSON_OBJECTAGG"
	tls                   "TLS"
	follower              "FOLLOWER"
	leader                "LEADER"
	learner               "LEARNER"
	voter                 "VOTER"

	/* The following tokens belong to TiDBKeyword. Notice: make sure these tokens are contained in TiDBKeyword. */
	admin                      "ADMIN"
	buckets                    "BUCKETS"
	builtins                   "BUILTINS"
	cancel                     "CANCEL"
	cardinality                "CARDINALITY"
	cmSketch                   "CMSKETCH"
	correlation                "CORRELATION"
	ddl                        "DDL"
	dependency                 "DEPENDENCY"
	depth                      "DEPTH"
	drainer                    "DRAINER"
	jobs                       "JOBS"
	job                        "JOB"
	nodeID                     "NODE_ID"
	nodeState                  "NODE_STATE"
	optimistic                 "OPTIMISTIC"
	pessimistic                "PESSIMISTIC"
	pump                       "PUMP"
	samples                    "SAMPLES"
	statistics                 "STATISTICS"
	stats                      "STATS"
	statsMeta                  "STATS_META"
	statsHistograms            "STATS_HISTOGRAMS"
	statsBuckets               "STATS_BUCKETS"
	statsHealthy               "STATS_HEALTHY"
	statsTopN                  "STATS_TOPN"
	telemetry                  "TELEMETRY"
	telemetryID                "TELEMETRY_ID"
	tidb                       "TIDB"
	tiFlash                    "TIFLASH"
	topn                       "TOPN"
	split                      "SPLIT"
	tag                        "TAG"
	edge                       "EDGE"
	width                      "WIDTH"
	reset                      "RESET"
	regions                    "REGIONS"
	region                     "REGION"
	builtinAddDate
	builtinBitAnd
	builtinBitOr
	builtinBitXor
	builtinCast
	builtinCount
	builtinApproxCountDistinct
	builtinApproxPercentile
	builtinCurDate
	builtinCurTime
	builtinDateAdd
	builtinDateSub
	builtinExtract
	builtinGroupConcat
	builtinMax
	builtinMin
	builtinNow
	builtinPosition
	builtinSubDate
	builtinSubstring
	builtinSum
	builtinSysDate
	builtinStddevPop
	builtinStddevSamp
	builtinTrim
	builtinUser
	builtinVarPop
	builtinVarSamp

%token	<item>

	/*yy:token "1.%d"   */
	floatLit "floating-point literal"

	/*yy:token "1.%d"   */
	decLit "decimal literal"

	/*yy:token "%d"     */
	intLit "integer literal"

	/*yy:token "%x"     */
	hexLit "hexadecimal literal"

	/*yy:token "%b"     */
	bitLit       "bit literal"
	andnot       "&^"
	assignmentEq ":="
	eq           "="
	ge           ">="
	le           "<="
	jss          "->"
	juss         "->>"
	lsh          "<<"
	neq          "!="
	neqSynonym   "<>"
	nulleq       "<=>"
	paramMarker  "?"
	rsh          ">>"

%token not2
%type	<expr>
	Expression             "expression"
	MaxValueOrExpression   "maxvalue or expression"
	BoolPri                "boolean primary expression"
	ExprOrDefault          "expression or default"
	PredicateExpr          "Predicate expression factor"
	SetExpr                "Set variable statement value's expression"
	BitExpr                "bit expression"
	SimpleExpr             "simple expression"
	SimpleIdent            "Simple Identifier expression"
	SumExpr                "aggregate functions"
	FunctionCallGeneric    "Function call with Identifier"
	FunctionCallKeyword    "Function call with keyword as function name"
	FunctionCallNonKeyword "Function call with nonkeyword as function name"
	Literal                "literal value"
	Variable               "User or system variable"
	SystemVariable         "System defined variable name"
	UserVariable           "User defined variable name"
	SubSelect              "Sub Select"
	SubSelect2             "Sub Select2"
	StringLiteral          "text literal"
	ExpressionOpt          "Optional expression"
	SignedLiteral          "Literal or NumLiteral with sign"
	DefaultValueExpr       "DefaultValueExpr(Now or Signed Literal)"
	NowSymOptionFraction   "NowSym with optional fraction part"
	CharsetNameOrDefault   "Character set name or default"
	NextValueForSequence   "Default nextval expression"
	FunctionNameSequence   "Function with sequence function call"
	WindowFuncCall         "WINDOW function call"
	RepeatableOpt          "Repeatable optional in sample clause"
	ProcedureCall          "Procedure call with Identifier or identifier"

%type	<statement>
	AdminStmt              "Check table statement or show ddl statement"
	AlterDatabaseStmt      "Alter database statement"
	AlterTableStmt         "Alter table statement"
	AlterUserStmt          "Alter user statement"
	AlterInstanceStmt      "Alter instance statement"
	AlterSequenceStmt      "Alter sequence statement"
	AnalyzeTableStmt       "Analyze table statement"
	BeginTransactionStmt   "BEGIN TRANSACTION statement"
	BinlogStmt             "Binlog base64 statement"
	BRIEStmt               "BACKUP or RESTORE statement"
	CommitStmt             "COMMIT statement"
	CreateTableStmt        "CREATE TABLE statement"
	CreateViewStmt         "CREATE VIEW  statement"
	CreateUserStmt         "CREATE User statement"
	CreateRoleStmt         "CREATE Role statement"
	CreateDatabaseStmt     "Create Database Statement"
	CreateIndexStmt        "CREATE INDEX statement"
	CreateBindingStmt      "CREATE BINDING  statement"
	CreateSequenceStmt     "CREATE SEQUENCE statement"
	CreateStatisticsStmt   "CREATE STATISTICS statement"
	DoStmt                 "Do statement"
	DropDatabaseStmt       "DROP DATABASE statement"
	DropIndexStmt          "DROP INDEX statement"
	DropStatisticsStmt     "DROP STATISTICS statement"
	DropStatsStmt          "DROP STATS statement"
	DropTableStmt          "DROP TABLE statement"
	DropSequenceStmt       "DROP SEQUENCE statement"
	DropUserStmt           "DROP USER"
	DropRoleStmt           "DROP ROLE"
	DropViewStmt           "DROP VIEW statement"
	DropBindingStmt        "DROP BINDING  statement"
	DeallocateStmt         "Deallocate prepared statement"
	DeleteFromStmt         "DELETE FROM statement"
	DeleteWithoutUsingStmt "Normal DELETE statement"
	DeleteWithUsingStmt    "DELETE USING statement"
	EmptyStmt              "empty statement"
	ExecuteStmt            "Execute statement"
	ExplainStmt            "EXPLAIN statement"
	ExplainableStmt        "explainable statement"
	FlushStmt              "Flush statement"
	FlashbackTableStmt     "Flashback table statement"
	GrantStmt              "Grant statement"
	GrantProxyStmt         "Grant proxy statement"
	GrantRoleStmt          "Grant role statement"
	InsertIntoStmt         "INSERT INTO statement"
	CallStmt               "CALL statement"
	IndexAdviseStmt        "INDEX ADVISE statement"
	KillStmt               "Kill statement"
	LoadDataStmt           "Load data statement"
	LoadStatsStmt          "Load statistic statement"
	LockTablesStmt         "Lock tables statement"
	PreparedStmt           "PreparedStmt"
	PurgeImportStmt        "PURGE IMPORT statement that removes a IMPORT task record"
	SelectStmt             "SELECT statement"
	RenameTableStmt        "rename table statement"
	ReplaceIntoStmt        "REPLACE INTO statement"
	RecoverTableStmt       "recover table statement"
	RevokeStmt             "Revoke statement"
	RevokeRoleStmt         "Revoke role statement"
	RollbackStmt           "ROLLBACK statement"
	SplitRegionStmt        "Split index region statement"
	SetStmt                "Set variable statement"
	ChangeStmt             "Change statement"
	SetRoleStmt            "Set active role statement"
	SetDefaultRoleStmt     "Set default statement for some user"
	ShowStmt               "Show engines/databases/tables/user/columns/warnings/status statement"
	Statement              "statement"
	TraceStmt              "TRACE statement"
	TraceableStmt          "traceable statement"
	TruncateTableStmt      "TRUNCATE TABLE statement"
	UnlockTablesStmt       "Unlock tables statement"
	UpdateStmt             "UPDATE statement"
	SetOprStmt             "Union/Except/Intersect select statement"
	SetOprStmt1            "Union/Except/Intersect select statement1"
	SetOprStmt2            "Union/Except/Intersect select statement2"
	UseStmt                "USE statement"
	ShutdownStmt           "SHUTDOWN statement"
	CreateViewSelectOpt    "Select/Union/Except/Intersect statement in CREATE VIEW ... AS SELECT"
	BindableStmt           "Statement that can be created binding on"

%type	<item>
	AdminShowSlow                          "Admin Show Slow statement"
	AllOrPartitionNameList                 "All or partition name list"
	AlgorithmClause                        "Alter table algorithm"
	AlterTablePartitionOpt                 "Alter table partition option"
	AlterTableSpec                         "Alter table specification"
	AlterTableSpecList                     "Alter table specification list"
	AlterTableSpecListOpt                  "Alter table specification list optional"
	AlterSequenceOption                    "Alter sequence option"
	AlterSequenceOptionList                "Alter sequence option list"
	AnalyzeOption                          "Analyze option"
	AnalyzeOptionList                      "Analyze option list"
	AnalyzeOptionListOpt                   "Optional analyze option list"
	AnyOrAll                               "Any or All for subquery"
	Assignment                             "assignment"
	AssignmentList                         "assignment list"
	AssignmentListOpt                      "assignment list opt"
	AuthOption                             "User auth option"
	Boolean                                "Boolean (0, 1, false, true)"
	OptionalBraces                         "optional braces"
	CastType                               "Cast function target type"
	ClearPasswordExpireOptions             "Clear password expire options"
	ColumnDef                              "table column definition"
	ColumnDefList                          "table column definition list"
	ColumnName                             "column name"
	ColumnNameOrUserVariable               "column name or user variable"
	ColumnNameList                         "column name list"
	ColumnNameOrUserVariableList           "column name or user variable list"
	ColumnList                             "column list"
	ColumnNameListOpt                      "column name list opt"
	ColumnNameOrUserVarListOpt             "column name or user vairiabe list opt"
	ColumnNameOrUserVarListOptWithBrackets "column name or user variable list opt with brackets"
	ColumnSetValue                         "insert statement set value by column name"
	ColumnSetValueList                     "insert statement set value by column name list"
	CompareOp                              "Compare opcode"
	ColumnOption                           "column definition option"
	ColumnOptionList                       "column definition option list"
	VirtualOrStored                        "indicate generated column is stored or not"
	ColumnOptionListOpt                    "optional column definition option list"
	CompletionTypeWithinTransaction        "overwrite system variable completion_type within current transaction"
	ConnectionOption                       "single connection options"
	ConnectionOptionList                   "connection options for CREATE USER statement"
	ConnectionOptions                      "optional connection options for CREATE USER statement"
	Constraint                             "table constraint"
	ConstraintElem                         "table constraint element"
	ConstraintKeywordOpt                   "Constraint Keyword or empty"
	CreateSequenceOptionListOpt            "create sequence list opt"
	CreateTableOptionListOpt               "create table option list opt"
	CreateTableSelectOpt                   "Select/Union statement in CREATE TABLE ... SELECT"
	DatabaseOption                         "CREATE Database specification"
	DatabaseOptionList                     "CREATE Database specification list"
	DatabaseOptionListOpt                  "CREATE Database specification list opt"
	DistinctOpt                            "Explicit distinct option"
	DefaultFalseDistinctOpt                "Distinct option which defaults to false"
	DefaultTrueDistinctOpt                 "Distinct option which defaults to true"
	BuggyDefaultFalseDistinctOpt           "Distinct option which accepts DISTINCT ALL and defaults to false"
	RequireClause                          "Encrypted connections options"
	RequireClauseOpt                       "optional Encrypted connections options"
	EqOpt                                  "= or empty"
	EscapedTableRef                        "escaped table reference"
	ExpressionList                         "expression list"
	ExtendedPriv                           "Extended privileges like LOAD FROM S3 or dynamic privileges"
	MaxValueOrExpressionList               "maxvalue or expression list"
	ExpressionListOpt                      "expression list opt"
	FetchFirstOpt                          "Fetch First/Next Option"
	FuncDatetimePrecListOpt                "Function datetime precision list opt"
	FuncDatetimePrecList                   "Function datetime precision list"
	Field                                  "field expression"
	Fields                                 "Fields clause"
	FieldList                              "field expression list"
	FlushOption                            "Flush option"
	InstanceOption                         "Instance option"
	FulltextSearchModifierOpt              "Fulltext modifier"
	PluginNameList                         "Plugin Name List"
	TableRefsClause                        "Table references clause"
	FieldItem                              "Field item for load data clause"
	FieldItemList                          "Field items for load data clause"
	FuncDatetimePrec                       "Function datetime precision"
	GetFormatSelector                      "{DATE|DATETIME|TIME|TIMESTAMP}"
	GlobalScope                            "The scope of variable"
	GroupByClause                          "GROUP BY clause"
	HavingClause                           "HAVING clause"
	HandleRange                            "handle range"
	HandleRangeList                        "handle range list"
	IfExists                               "If Exists"
	IfNotExists                            "If Not Exists"
	IgnoreOptional                         "IGNORE or empty"
	IndexHint                              "index hint"
	IndexHintList                          "index hint list"
	IndexHintListOpt                       "index hint list opt"
	IndexHintScope                         "index hint scope"
	IndexHintType                          "index hint type"
	IndexInvisible                         "index visible/invisible"
	IndexKeyTypeOpt                        "index key type"
	IndexLockAndAlgorithmOpt               "index lock and algorithm"
	IndexNameAndTypeOpt                    "index name and index type"
	IndexNameList                          "index name list"
	IndexOption                            "Index Option"
	IndexOptionList                        "Index Option List or empty"
	IndexType                              "index type"
	IndexName                              "index name"
	IndexTypeName                          "index type name"
	IndexTypeOpt                           "optional index type"
	IndexPartSpecification                 "Index column name or expression"
	IndexPartSpecificationList             "List of index column name or expression"
	IndexPartSpecificationListOpt          "Optional list of index column name or expression"
	InsertValues                           "Rest part of INSERT/REPLACE INTO statement"
	JoinTable                              "join table"
	JoinType                               "join type"
	KillOrKillTiDB                         "Kill or Kill TiDB"
	LocationLabelList                      "location label name list"
	LikeTableWithOrWithoutParen            "LIKE table_name or ( LIKE table_name )"
	LimitClause                            "LIMIT clause"
	LimitOption                            "Limit option could be integer or parameter marker."
	Lines                                  "Lines clause"
	LoadDataSetSpecOpt                     "Optional load data specification"
	LoadDataSetList                        "Load data specifications"
	LoadDataSetItem                        "Single load data specification"
	LocalOpt                               "Local opt"
	LockClause                             "Alter table lock clause"
	LogTypeOpt                             "Optional log type used in FLUSH statements"
	NumLiteral                             "Num/Int/Float/Decimal Literal"
	NoWriteToBinLogAliasOpt                "NO_WRITE_TO_BINLOG alias LOCAL or empty"
	ObjectType                             "Grant statement object type"
	OnDuplicateKeyUpdate                   "ON DUPLICATE KEY UPDATE value list"
	DuplicateOpt                           "[IGNORE|REPLACE] in CREATE TABLE ... SELECT statement or LOAD DATA statement"
	OptFull                                "Full or empty"
	OptTemporary                           "TEMPORARY or empty"
	OptOrder                               "Optional ordering keyword: ASC/DESC. Default to ASC"
	Order                                  "Ordering keyword: ASC or DESC"
	OptionLevel                            "3 levels used by lightning config"
	OrderBy                                "ORDER BY clause"
	OrReplace                              "or replace"
	ByItem                                 "BY item"
	OrderByOptional                        "Optional ORDER BY clause optional"
	ByList                                 "BY list"
	AlterOrderItem                         "Alter Order item"
	AlterOrderList                         "Alter Order list"
	QuickOptional                          "QUICK or empty"
	PartitionDefinition                    "Partition definition"
	PartitionDefinitionList                "Partition definition list"
	PartitionDefinitionListOpt             "Partition definition list option"
	PartitionKeyAlgorithmOpt               "ALGORITHM = n option for KEY partition"
	PartitionMethod                        "Partition method"
	PartitionOpt                           "Partition option"
	PartitionNameList                      "Partition name list"
	PartitionNameListOpt                   "table partition names list optional"
	PartitionNumOpt                        "PARTITION NUM option"
	PartDefValuesOpt                       "VALUES {LESS THAN {(expr | value_list) | MAXVALUE} | IN {value_list}"
	PartDefOptionList                      "PartDefOption list"
	PartDefOption                          "COMMENT [=] xxx | TABLESPACE [=] tablespace_name | ENGINE [=] xxx"
	PasswordExpire                         "Single password option for create user statement"
	PasswordOrLockOption                   "Single password or lock option for create user statement"
	PasswordOrLockOptionList               "Password or lock options for create user statement"
	PasswordOrLockOptions                  "Optional password or lock options for create user statement"
	ColumnPosition                         "Column position [First|After ColumnName]"
	PrepareSQL                             "Prepare statement sql string"
	Priority                               "Statement priority"
	PriorityOpt                            "Statement priority option"
	PrivElem                               "Privilege element"
	PrivLevel                              "Privilege scope"
	PrivType                               "Privilege type"
	ReferDef                               "Reference definition"
	OnDelete                               "ON DELETE clause"
	OnUpdate                               "ON UPDATE clause"
	OnDeleteUpdateOpt                      "optional ON DELETE and UPDATE clause"
	OptGConcatSeparator                    "optional GROUP_CONCAT SEPARATOR"
	ReferOpt                               "reference option"
	ReorganizePartitionRuleOpt             "optional reorganize partition partition list and definitions"
	RequireList                            "require list"
	RequireListElement                     "require list element"
	Rolename                               "Rolename"
	RolenameComposed                       "Rolename that composed with more than 1 symbol"
	RolenameList                           "RolenameList"
	RolenameWithoutIdent                   "Rolename except identifier"
	RoleOrPrivElem                         "Element that may be a Rolename or PrivElem"
	RoleOrPrivElemList                     "RoleOrPrivElem list"
	RoleSpec                               "Rolename and auth option"
	RoleSpecList                           "Rolename and auth option list"
	RowFormat                              "Row format option"
	RowValue                               "Row value"
	RowStmt                                "Row constructor"
	SelectLockOpt                          "SELECT lock options"
	SelectStmtSQLCache                     "SELECT statement optional SQL_CAHCE/SQL_NO_CACHE"
	SelectStmtFieldList                    "SELECT statement field list"
	SelectStmtLimit                        "SELECT statement LIMIT clause"
	SelectStmtLimitOpt                     "SELECT statement optional LIMIT clause"
	SelectStmtOpt                          "Select statement option"
	SelectStmtOpts                         "Select statement options"
	SelectStmtOptsList                     "Select statement options list"
	SelectStmtBasic                        "SELECT statement from constant value"
	SelectStmtFromDualTable                "SELECT statement from dual table"
	SelectStmtFromTable                    "SELECT statement from table"
	SelectStmtGroup                        "SELECT statement optional GROUP BY clause"
	SelectStmtIntoOption                   "SELECT statement into clause"
	SequenceOption                         "Create sequence option"
	SequenceOptionList                     "Create sequence option list"
	SetRoleOpt                             "Set role options"
	SetDefaultRoleOpt                      "Set default role options"
	SetOpr                                 "Set operator contain UNION, EXCEPT and INTERSECT"
	SetOprClause                           "Union/Except/Intersect select clause"
	SetOprClauseList                       "Union/Except/Intersect select clause list"
	ShowTargetFilterable                   "Show target that can be filtered by WHERE or LIKE"
	ShowTableAliasOpt                      "Show table alias option"
	ShowLikeOrWhereOpt                     "Show like or where clause option"
	ShowProfileArgsOpt                     "Show profile args option"
	ShowProfileTypesOpt                    "Show profile types option"
	ShowProfileType                        "Show profile type"
	ShowProfileTypes                       "Show profile types"
	SplitOption                            "Split Option"
	SplitSyntaxOption                      "Split syntax Option"
	StatementList                          "statement list"
	StatsPersistentVal                     "stats_persistent value"
	StatsType                              "stats type value"
	StringList                             "string list"
	SubPartDefinition                      "SubPartition definition"
	SubPartDefinitionList                  "SubPartition definition list"
	SubPartDefinitionListOpt               "SubPartition definition list optional"
	SubPartitionMethod                     "SubPartition method"
	SubPartitionOpt                        "SubPartition option"
	SubPartitionNumOpt                     "SubPartition NUM option"
	TableAliasRefList                      "table alias reference list"
	TableAsName                            "table alias name"
	TableAsNameOpt                         "table alias name optional"
	TableElement                           "table definition element"
	TableElementList                       "table definition element list"
	TableElementListOpt                    "table definition element list optional"
	TableFactor                            "table factor"
	TableLock                              "Table name and lock type"
	TableLockList                          "Table lock list"
	TableName                              "Table name"
	TableNameOptWild                       "Table name with optional wildcard"
	TableNameList                          "Table name list"
	TableNameListOpt                       "Table name list opt"
	TableOption                            "create table option"
	TableOptionList                        "create table option list"
	TableRef                               "table reference"
	TableRefs                              "table references"
	TableSampleOpt                         "table sample clause optional"
	TableSampleMethodOpt                   "table sample method optional"
	TableSampleUnitOpt                     "table sample unit optional"
	TableToTable                           "rename table to table"
	TableToTableList                       "rename table to table by list"
	TextStringList                         "text string list"
	TimeUnit                               "Time unit for 'DATE_ADD', 'DATE_SUB', 'ADDDATE', 'SUBDATE', 'EXTRACT'"
	TimestampUnit                          "Time unit for 'TIMESTAMPADD' and 'TIMESTAMPDIFF'"
	TimestampBound                         "Timestamp bound for start transaction with timestamp mode"
	LockType                               "Table locks type"
	TransactionChar                        "Transaction characteristic"
	TransactionChars                       "Transaction characteristic list"
	TrimDirection                          "Trim string direction"
	SetOprOpt                              "Union/Except/Intersect Option(empty/ALL/DISTINCT)"
	Username                               "Username"
	UsernameList                           "UsernameList"
	UserSpec                               "Username and auth option"
	UserSpecList                           "Username and auth option list"
	UserVariableList                       "User defined variable name list"
	UsingRoles                             "UsingRoles is role option for SHOW GRANT"
	Values                                 "values"
	ValuesList                             "values list"
	ValuesOpt                              "values optional"
	ValuesStmtList                         "VALUES statement field list"
	VariableAssignment                     "set variable value"
	VariableAssignmentList                 "set variable value list"
	ViewAlgorithm                          "view algorithm"
	ViewCheckOption                        "view check option"
	ViewDefiner                            "view definer"
	ViewName                               "view name"
	ViewFieldList                          "create view statement field list"
	ViewSQLSecurity                        "view sql security"
	WhereClause                            "WHERE clause"
	WhereClauseOptional                    "Optional WHERE clause"
	TraverseClause                         "TRAVERSE clause"
	TraverseChain                          "TRAVERSE chain"
	TraverseVerb                           "TRAVERSE verb"
	TraverseOptional                       "Optional TRAVERSE clause"
	TraverseTargets                        "Traverse targets"
	WhenClause                             "When clause"
	WhenClauseList                         "When clause list"
	WithReadLockOpt                        "With Read Lock opt"
	WithGrantOptionOpt                     "With Grant Option opt"
	WithValidation                         "with validation"
	WithValidationOpt                      "optional with validation"
	Writeable                              "Table writeable status"
	ElseOpt                                "Optional else clause"
	Type                                   "Types"
	OptExistingWindowName                  "Optional existing WINDOW name"
	OptFromFirstLast                       "Optional FROM FIRST/LAST"
	OptLLDefault                           "Optional LEAD/LAG default"
	OptLeadLagInfo                         "Optional LEAD/LAG info"
	OptNullTreatment                       "Optional NULL treatment"
	OptPartitionClause                     "Optional PARTITION clause"
	OptWild                                "Optional Wildcard"
	OptWindowOrderByClause                 "Optional ORDER BY clause in WINDOW"
	OptWindowFrameClause                   "Optional FRAME clause in WINDOW"
	OptWindowingClause                     "Optional OVER clause"
	WindowingClause                        "OVER clause"
	WindowClauseOptional                   "Optional WINDOW clause"
	WindowDefinitionList                   "WINDOW definition list"
	WindowDefinition                       "WINDOW definition"
	WindowFrameUnits                       "WINDOW frame units"
	WindowFrameBetween                     "WINDOW frame between"
	WindowFrameBound                       "WINDOW frame bound"
	WindowFrameExtent                      "WINDOW frame extent"
	WindowFrameStart                       "WINDOW frame start"
	WindowName                             "WINDOW name"
	WindowNameOrSpec                       "WINDOW name or spec"
	WindowSpec                             "WINDOW spec"
	WindowSpecDetails                      "WINDOW spec details"
	BetweenOrNotOp                         "Between predicate"
	IsOrNotOp                              "Is predicate"
	InOrNotOp                              "In predicate"
	LikeOrNotOp                            "Like predicate"
	RegexpOrNotOp                          "Regexp predicate"
	NumericType                            "Numeric types"
	IntegerType                            "Integer Types types"
	BooleanType                            "Boolean Types types"
	FixedPointType                         "Exact value types"
	FloatingPointType                      "Approximate value types"
	BitValueType                           "bit value types"
	StringType                             "String types"
	BlobType                               "Blob types"
	TextType                               "Text types"
	DateAndTimeType                        "Date and Time types"
	OptFieldLen                            "Field length or empty"
	FieldLen                               "Field length"
	FieldOpts                              "Field type definition option list"
	FieldOpt                               "Field type definition option"
	FloatOpt                               "Floating-point type option"
	Precision                              "Floating-point precision option"
	OptBinary                              "Optional BINARY"
	OptBinMod                              "Optional BINARY mode"
	OptCharsetWithOptBinary                "Optional BINARY or ASCII or UNICODE or BYTE"
	IgnoreLines                            "Ignore num(int) lines"
	Int64Num                               "a number that can be safely converted to int64"
	NUM                                    "A number"
	NumList                                "Some numbers"
	LengthNum                              "Field length num(uint64)"
	SignedNum                              "Signed num(int64)"
	TableOptimizerHints                    "Table level optimizer hints"
	TableOptimizerHintsOpt                 "Table level optimizer hints option"
	EnforcedOrNot                          "{ENFORCED|NOT ENFORCED}"
	EnforcedOrNotOpt                       "Optional {ENFORCED|NOT ENFORCED}"
	EnforcedOrNotOrNotNullOpt              "{[ENFORCED|NOT ENFORCED|NOT NULL]}"
	Match                                  "[MATCH FULL | MATCH PARTIAL | MATCH SIMPLE]"
	MatchOpt                               "optional MATCH clause"
	MaxMinutesOpt                          "MAX_MINUTES num(int)"
	MaxIndexNumOpt                         "MAX_IDXNUM clause"
	PerTable                               "Max index number PER_TABLE"
	PerDB                                  "Max index number PER_DB"
	BRIETables                             "List of tables or databases for BRIE statements"
	DBNameList                             "List of database names"
	BRIEOption                             "Single BRIE option"
	BRIEOptions                            "List of BRIE options"
	BRIEIntegerOptionName                  "Name of a BRIE option which takes an integer as input"
	BRIEBooleanOptionName                  "Name of a BRIE option which takes a boolean as input"
	BRIEStringOptionName                   "Name of a BRIE option which takes a string as input"
	BRIEKeywordOptionName                  "Name of a BRIE option which takes a case-insensitive string as input"
	PlacementCount                         "Placement rules count option"
	PlacementLabelConstraints              "Placement rules label constraints option"
	PlacementRole                          "Placement rules role option"
	PlacementOptions                       "Placement rules options"
	PlacementSpec                          "Placement rules specification"
	PlacementSpecList                      "Placement rules specifications"

%type	<ident>
	AsOpt             "AS or EmptyString"
	KeyOrIndex        "{KEY|INDEX}"
	ColumnKeywordOpt  "Column keyword or empty"
	PrimaryOpt        "Optional primary keyword"
	NowSym            "CURRENT_TIMESTAMP/LOCALTIME/LOCALTIMESTAMP"
	NowSymFunc        "CURRENT_TIMESTAMP/LOCALTIME/LOCALTIMESTAMP/NOW"
	DefaultKwdOpt     "optional DEFAULT keyword"
	DatabaseSym       "DATABASE or SCHEMA"
	ExplainSym        "EXPLAIN or DESCRIBE or DESC"
	RegexpSym         "REGEXP or RLIKE"
	IntoOpt           "INTO or EmptyString"
	ValueSym          "Value or Values"
	NotSym            "Not token"
	Char              "{CHAR|CHARACTER}"
	NChar             "{NCHAR|NATIONAL CHARACTER|NATIONAL CHAR}"
	Varchar           "{VARCHAR|VARCHARACTER|CHARACTER VARYING|CHAR VARYING}"
	NVarchar          "{NATIONAL VARCHAR|NATIONAL VARCHARACTER|NVARCHAR|NCHAR VARCHAR|NATIONAL CHARACTER VARYING|NATIONAL CHAR VARYING|NCHAR VARYING}"
	Year              "{YEAR|SQL_TSI_YEAR}"
	DeallocateSym     "Deallocate or drop"
	OuterOpt          "optional OUTER clause"
	CrossOpt          "Cross join option"
	TablesTerminalSym "{TABLE|TABLES}"
	IsolationLevel    "Isolation level"
	ShowIndexKwd      "Show index/indexs/key keyword"
	DistinctKwd       "DISTINCT/DISTINCTROW keyword"
	FromOrIn          "From or In"
	OptTable          "Optional table keyword"
	OptInteger        "Optional Integer keyword"
	CharsetKw         "charset or charater set"
	CommaOpt          "optional comma"
	logAnd            "logical and operator"
	logOr             "logical or operator"
	LinearOpt         "linear or empty"
	FieldsOrColumns   "Fields or columns"
	StorageMedia      "{DISK|MEMORY|DEFAULT}"
	EncryptionOpt     "Encryption option 'Y' or 'N'"
	FirstOrNext       "FIRST or NEXT"
	RowOrRows         "ROW or ROWS"

%type	<ident>
	ODBCDateTimeType                "ODBC type keywords for date and time literals"
	Identifier                      "identifier or unreserved keyword"
	NotKeywordToken                 "Tokens not mysql keyword but treated specially"
	UnReservedKeyword               "MySQL unreserved keywords"
	TiDBKeyword                     "TiDB added keywords"
	FunctionNameConflict            "Built-in function call names which are conflict with keywords"
	FunctionNameOptionalBraces      "Function with optional braces, all of them are reserved keywords."
	FunctionNameDatetimePrecision   "Function with optional datetime precision, all of them are reserved keywords."
	FunctionNameDateArith           "Date arith function call names (date_add or date_sub)"
	FunctionNameDateArithMultiForms "Date arith function call names (adddate or subdate)"
	VariableName                    "A simple Identifier like xx or the xx.xx form"
	ConfigItemName                  "A config item like aa or aa.bb or aa.bb-cc.dd"
	AuthString                      "Password string value"
	CharsetName                     "Character set name"
	CollationName                   "Collation name"
	ColumnFormat                    "Column format"
	DBName                          "Database Name"
	ExplainFormatType               "explain format type"
	FieldAsName                     "Field alias name"
	FieldAsNameOpt                  "Field alias name opt"
	FieldTerminator                 "Field terminator"
	FlashbackToNewName              "Flashback to new name"
	HashString                      "Hashed string"
	LikeEscapeOpt                   "like escape option"
	LinesTerminated                 "Lines terminated by"
	OptCharset                      "Optional Character setting"
	OptCollate                      "Optional Collate setting"
	PasswordOpt                     "Password option"
	RoleNameString                  "role name string"
	ShowDatabaseNameOpt             "Show tables/columns statement database name option"
	Starting                        "Starting by"
	StringName                      "string literal or identifier"
	StringNameOrBRIEOptionKeyword   "string literal or identifier or keyword used for BRIE options"
	Symbol                          "Constraint Symbol"
	TextString                      "text string item"

%precedence empty
%precedence lowerThanSelectOpt
%precedence sqlBufferResult
%precedence sqlBigResult
%precedence sqlSmallResult
%precedence sqlCache sqlNoCache
%precedence lowerThanIntervalKeyword
%precedence interval
%precedence next
%precedence lowerThanValueKeyword
%precedence value
%precedence lowerThanStringLitToken
%precedence stringLit
%precedence lowerThanSetKeyword
%precedence set
%precedence lowerThanInsertValues
%precedence insertValues
%precedence lowerThanCreateTableSelect
%precedence createTableSelect
%precedence lowerThanCharsetKwd
%precedence charsetKwd
%precedence lowerThanKey
%precedence key
%precedence lowerThanLocal
%precedence local
%precedence lowerThanRemove
%precedence remove
%precedence lowerThenOrder
%precedence order
%precedence lowerThanFunction
%precedence function

/* A dummy token to force the priority of TableRef production in a join. */
%left tableRefPriority
%left join straightJoin inner cross left right full natural
%precedence lowerThanOn
%precedence on using
%right assignmentEq
%left pipes or pipesAsOr
%left xor
%left andand and
%left between
%precedence lowerThanEq
%left eq ge le neq neqSynonym '>' '<' is like in
%left '|'
%left '&'
%left rsh lsh
%left '-' '+'
%left '*' '/' '%' div mod
%left '^'
%left '~' neg
%precedence lowerThanNot
%right not not2
%right collate
%right encryption
%left labels
%precedence lowerThanParenthese
%precedence '(' ')'
%precedence higherThanParenthese
%precedence quick
%precedence escape
%precedence lowerThanComma
%precedence ','
%precedence higherThanComma

%start	Start

%%

Start:
	StatementList

/**************************************AlterTableStmt***************************************
 * See https://dev.mysql.com/doc/refman/5.7/en/alter-table.html
 *******************************************************************************************/
AlterTableStmt:
	"ALTER" IgnoreOptional "TABLE" TableName AlterTableSpecListOpt AlterTablePartitionOpt
	{
		specs := $5.([]*ast.AlterTableSpec)
		if $6 != nil {
			specs = append(specs, $6.(*ast.AlterTableSpec))
		}
		$$ = &ast.AlterTableStmt{
			Table: $4.(*ast.TableName),
			Specs: specs,
		}
	}
|	"ALTER" IgnoreOptional "TABLE" TableName "ANALYZE" "PARTITION" PartitionNameList AnalyzeOptionListOpt
	{
		$$ = &ast.AnalyzeTableStmt{TableNames: []*ast.TableName{$4.(*ast.TableName)}, PartitionNames: $7.([]model.CIStr), AnalyzeOpts: $8.([]ast.AnalyzeOpt)}
	}
|	"ALTER" IgnoreOptional "TABLE" TableName "ANALYZE" "PARTITION" PartitionNameList "INDEX" IndexNameList AnalyzeOptionListOpt
	{
		$$ = &ast.AnalyzeTableStmt{
			TableNames:     []*ast.TableName{$4.(*ast.TableName)},
			PartitionNames: $7.([]model.CIStr),
			IndexNames:     $9.([]model.CIStr),
			IndexFlag:      true,
			AnalyzeOpts:    $10.([]ast.AnalyzeOpt),
		}
	}

PlacementRole:
	"ROLE" "=" "FOLLOWER"
	{
		$$ = ast.PlacementRoleFollower
	}
|	"ROLE" "=" "LEADER"
	{
		$$ = ast.PlacementRoleLeader
	}
|	"ROLE" "=" "LEARNER"
	{
		$$ = ast.PlacementRoleLearner
	}
|	"ROLE" "=" "VOTER"
	{
		$$ = ast.PlacementRoleVoter
	}

PlacementCount:
	"REPLICAS" "=" LengthNum
	{
		cnt := $3.(uint64)
		if cnt == 0 {
			yylex.AppendError(yylex.Errorf("Invalid placement option REPLICAS, it is not allowed to be 0"))
			return 1
		}
		$$ = cnt
	}

PlacementLabelConstraints:
	"CONSTRAINTS" "=" stringLit
	{
		$$ = $3
	}

PlacementOptions:
	PlacementCount
	{
		$$ = &ast.PlacementSpec{
			Replicas: $1.(uint64),
		}
	}
|	PlacementLabelConstraints
	{
		$$ = &ast.PlacementSpec{
			Constraints: $1.(string),
		}
	}
|	PlacementRole
	{
		$$ = &ast.PlacementSpec{
			Role: $1.(ast.PlacementRole),
		}
	}
|	PlacementOptions PlacementCount
	{
		spec := $1.(*ast.PlacementSpec)
		if spec.Replicas != 0 {
			yylex.AppendError(yylex.Errorf("Duplicate placement option REPLICAS"))
			return 1
		}
		spec.Replicas = $2.(uint64)
		$$ = spec
	}
|	PlacementOptions PlacementLabelConstraints
	{
		spec := $1.(*ast.PlacementSpec)
		if len(spec.Constraints) > 0 {
			yylex.AppendError(yylex.Errorf("Duplicate placement option CONSTRAINTS"))
			return 1
		}
		spec.Constraints = $2.(string)
		$$ = spec
	}
|	PlacementOptions PlacementRole
	{
		spec := $1.(*ast.PlacementSpec)
		if spec.Role != ast.PlacementRoleNone {
			yylex.AppendError(yylex.Errorf("Duplicate placement option ROLE"))
			return 1
		}
		spec.Role = $2.(ast.PlacementRole)
		$$ = spec
	}

PlacementSpec:
	"ADD" "PLACEMENT" "POLICY" PlacementOptions
	{
		spec := $4.(*ast.PlacementSpec)
		spec.Tp = ast.PlacementAdd
		$$ = spec
	}
|	"ALTER" "PLACEMENT" "POLICY" PlacementOptions
	{
		spec := $4.(*ast.PlacementSpec)
		spec.Tp = ast.PlacementAlter
		$$ = spec
	}
|	"DROP" "PLACEMENT" "POLICY" PlacementRole
	{
		spec := &ast.PlacementSpec{Role: $4.(ast.PlacementRole)}
		spec.Tp = ast.PlacementDrop
		$$ = spec
	}

PlacementSpecList:
	PlacementSpec
	{
		$$ = []*ast.PlacementSpec{$1.(*ast.PlacementSpec)}
	}
|	PlacementSpecList ',' PlacementSpec
	{
		$$ = append($1.([]*ast.PlacementSpec), $3.(*ast.PlacementSpec))
	}

AlterTablePartitionOpt:
	PartitionOpt
	{
		if $1 != nil {
			$$ = &ast.AlterTableSpec{
				Tp:        ast.AlterTablePartition,
				Partition: $1.(*ast.PartitionOptions),
			}
		} else {
			$$ = nil
		}
	}
|	"REMOVE" "PARTITIONING"
	{
		$$ = &ast.AlterTableSpec{
			Tp: ast.AlterTableRemovePartitioning,
		}
	}
|	"REORGANIZE" "PARTITION" NoWriteToBinLogAliasOpt ReorganizePartitionRuleOpt
	{
		ret := $4.(*ast.AlterTableSpec)
		ret.NoWriteToBinlog = $3.(bool)
		$$ = ret
	}

LocationLabelList:
	{
		$$ = []string{}
	}
|	"LOCATION" "LABELS" StringList
	{
		$$ = $3
	}

AlterTableSpec:
	TableOptionList %prec higherThanComma
	{
		$$ = &ast.AlterTableSpec{
			Tp:      ast.AlterTableOption,
			Options: $1.([]*ast.TableOption),
		}
	}
|	"SET" "TIFLASH" "REPLICA" LengthNum LocationLabelList
	{
		tiflashReplicaSpec := &ast.TiFlashReplicaSpec{
			Count:  $4.(uint64),
			Labels: $5.([]string),
		}
		$$ = &ast.AlterTableSpec{
			Tp:             ast.AlterTableSetTiFlashReplica,
			TiFlashReplica: tiflashReplicaSpec,
		}
	}
|	"CONVERT" "TO" CharsetKw CharsetName OptCollate
	{
		op := &ast.AlterTableSpec{
			Tp: ast.AlterTableOption,
			Options: []*ast.TableOption{{Tp: ast.TableOptionCharset, StrValue: $4,
				UintValue: ast.TableOptionCharsetWithConvertTo}},
		}
		if $5 != "" {
			op.Options = append(op.Options, &ast.TableOption{Tp: ast.TableOptionCollate, StrValue: $5})
		}
		$$ = op
	}
|	"CONVERT" "TO" CharsetKw "DEFAULT" OptCollate
	{
		op := &ast.AlterTableSpec{
			Tp: ast.AlterTableOption,
			Options: []*ast.TableOption{{Tp: ast.TableOptionCharset, Default: true,
				UintValue: ast.TableOptionCharsetWithConvertTo}},
		}
		if $5 != "" {
			op.Options = append(op.Options, &ast.TableOption{Tp: ast.TableOptionCollate, StrValue: $5})
		}
		$$ = op
	}
|	"ADD" ColumnKeywordOpt IfNotExists ColumnDef ColumnPosition
	{
		$$ = &ast.AlterTableSpec{
			IfNotExists: $3.(bool),
			Tp:          ast.AlterTableAddColumns,
			NewColumns:  []*ast.ColumnDef{$4.(*ast.ColumnDef)},
			Position:    $5.(*ast.ColumnPosition),
		}
	}
|	"ADD" ColumnKeywordOpt IfNotExists '(' TableElementList ')'
	{
		tes := $5.([]interface{})
		var columnDefs []*ast.ColumnDef
		var constraints []*ast.Constraint
		for _, te := range tes {
			switch te := te.(type) {
			case *ast.ColumnDef:
				columnDefs = append(columnDefs, te)
			case *ast.Constraint:
				constraints = append(constraints, te)
			}
		}
		$$ = &ast.AlterTableSpec{
			IfNotExists:    $3.(bool),
			Tp:             ast.AlterTableAddColumns,
			NewColumns:     columnDefs,
			NewConstraints: constraints,
		}
	}
|	"ADD" Constraint
	{
		constraint := $2.(*ast.Constraint)
		$$ = &ast.AlterTableSpec{
			Tp:         ast.AlterTableAddConstraint,
			Constraint: constraint,
		}
	}
|	"ADD" "PARTITION" IfNotExists NoWriteToBinLogAliasOpt PartitionDefinitionListOpt
	{
		var defs []*ast.PartitionDefinition
		if $5 != nil {
			defs = $5.([]*ast.PartitionDefinition)
		}
		noWriteToBinlog := $4.(bool)
		if noWriteToBinlog {
			yylex.AppendError(yylex.Errorf("The NO_WRITE_TO_BINLOG option is parsed but ignored for now."))
			parser.lastErrorAsWarn()
		}
		$$ = &ast.AlterTableSpec{
			IfNotExists:     $3.(bool),
			NoWriteToBinlog: noWriteToBinlog,
			Tp:              ast.AlterTableAddPartitions,
			PartDefinitions: defs,
		}
	}
|	"ADD" "PARTITION" IfNotExists NoWriteToBinLogAliasOpt "PARTITIONS" NUM
	{
		noWriteToBinlog := $4.(bool)
		if noWriteToBinlog {
			yylex.AppendError(yylex.Errorf("The NO_WRITE_TO_BINLOG option is parsed but ignored for now."))
			parser.lastErrorAsWarn()
		}
		$$ = &ast.AlterTableSpec{
			IfNotExists:     $3.(bool),
			NoWriteToBinlog: noWriteToBinlog,
			Tp:              ast.AlterTableAddPartitions,
			Num:             getUint64FromNUM($6),
		}
	}
|	"ADD" "TIDB_STATS" IfNotExists Identifier StatsType '(' ColumnNameList ')'
	{
		statsSpec := &ast.StatisticsSpec{
			StatsName: $4,
			StatsType: $5.(uint8),
			Columns:   $7.([]*ast.ColumnName),
		}
		$$ = &ast.AlterTableSpec{
			Tp:          ast.AlterTableAddStatistics,
			IfNotExists: $3.(bool),
			Statistics:  statsSpec,
		}
	}
|	"ALTER" "PARTITION" Identifier PlacementSpecList %prec lowerThanComma
	{
		$$ = &ast.AlterTableSpec{
			Tp:             ast.AlterTableAlterPartition,
			PartitionNames: []model.CIStr{model.NewCIStr($3)},
			PlacementSpecs: $4.([]*ast.PlacementSpec),
		}
	}
|	"CHECK" "PARTITION" AllOrPartitionNameList
	{
		yylex.AppendError(yylex.Errorf("The CHECK PARTITIONING clause is parsed but not implement yet."))
		parser.lastErrorAsWarn()
		ret := &ast.AlterTableSpec{
			Tp: ast.AlterTableCheckPartitions,
		}
		if $3 == nil {
			ret.OnAllPartitions = true
		} else {
			ret.PartitionNames = $3.([]model.CIStr)
		}
		$$ = ret
	}
|	"COALESCE" "PARTITION" NoWriteToBinLogAliasOpt NUM
	{
		noWriteToBinlog := $3.(bool)
		if noWriteToBinlog {
			yylex.AppendError(yylex.Errorf("The NO_WRITE_TO_BINLOG option is parsed but ignored for now."))
			parser.lastErrorAsWarn()
		}
		$$ = &ast.AlterTableSpec{
			Tp:              ast.AlterTableCoalescePartitions,
			NoWriteToBinlog: noWriteToBinlog,
			Num:             getUint64FromNUM($4),
		}
	}
|	"DROP" ColumnKeywordOpt IfExists ColumnName RestrictOrCascadeOpt
	{
		$$ = &ast.AlterTableSpec{
			IfExists:      $3.(bool),
			Tp:            ast.AlterTableDropColumn,
			OldColumnName: $4.(*ast.ColumnName),
		}
	}
|	"DROP" "PRIMARY" "KEY"
	{
		$$ = &ast.AlterTableSpec{Tp: ast.AlterTableDropPrimaryKey}
	}
|	"DROP" "PARTITION" IfExists PartitionNameList %prec lowerThanComma
	{
		$$ = &ast.AlterTableSpec{
			IfExists:       $3.(bool),
			Tp:             ast.AlterTableDropPartition,
			PartitionNames: $4.([]model.CIStr),
		}
	}
|	"DROP" "TIDB_STATS" IfExists Identifier
	{
		statsSpec := &ast.StatisticsSpec{
			StatsName: $4,
		}
		$$ = &ast.AlterTableSpec{
			Tp:         ast.AlterTableDropStatistics,
			IfExists:   $3.(bool),
			Statistics: statsSpec,
		}
	}
|	"EXCHANGE" "PARTITION" Identifier "WITH" "TABLE" TableName WithValidationOpt
	{
		$$ = &ast.AlterTableSpec{
			Tp:             ast.AlterTableExchangePartition,
			PartitionNames: []model.CIStr{model.NewCIStr($3)},
			NewTable:       $6.(*ast.TableName),
			WithValidation: $7.(bool),
		}
	}
|	"TRUNCATE" "PARTITION" AllOrPartitionNameList
	{
		ret := &ast.AlterTableSpec{
			Tp: ast.AlterTableTruncatePartition,
		}
		if $3 == nil {
			ret.OnAllPartitions = true
			yylex.AppendError(yylex.Errorf("The TRUNCATE PARTITION ALL clause is parsed but ignored by all storage engines."))
			parser.lastErrorAsWarn()
		} else {
			ret.PartitionNames = $3.([]model.CIStr)
		}
		$$ = ret
	}
|	"OPTIMIZE" "PARTITION" NoWriteToBinLogAliasOpt AllOrPartitionNameList
	{
		ret := &ast.AlterTableSpec{
			NoWriteToBinlog: $3.(bool),
			Tp:              ast.AlterTableOptimizePartition,
		}
		if $4 == nil {
			ret.OnAllPartitions = true
		} else {
			ret.PartitionNames = $4.([]model.CIStr)
		}
		$$ = ret
	}
|	"REPAIR" "PARTITION" NoWriteToBinLogAliasOpt AllOrPartitionNameList
	{
		ret := &ast.AlterTableSpec{
			NoWriteToBinlog: $3.(bool),
			Tp:              ast.AlterTableRepairPartition,
		}
		if $4 == nil {
			ret.OnAllPartitions = true
		} else {
			ret.PartitionNames = $4.([]model.CIStr)
		}
		$$ = ret
	}
|	"IMPORT" "PARTITION" AllOrPartitionNameList "TABLESPACE"
	{
		ret := &ast.AlterTableSpec{
			Tp: ast.AlterTableImportPartitionTablespace,
		}
		if $3 == nil {
			ret.OnAllPartitions = true
		} else {
			ret.PartitionNames = $3.([]model.CIStr)
		}
		$$ = ret
		yylex.AppendError(yylex.Errorf("The IMPORT PARTITION TABLESPACE clause is parsed but ignored by all storage engines."))
		parser.lastErrorAsWarn()
	}
|	"DISCARD" "PARTITION" AllOrPartitionNameList "TABLESPACE"
	{
		ret := &ast.AlterTableSpec{
			Tp: ast.AlterTableDiscardPartitionTablespace,
		}
		if $3 == nil {
			ret.OnAllPartitions = true
		} else {
			ret.PartitionNames = $3.([]model.CIStr)
		}
		$$ = ret
		yylex.AppendError(yylex.Errorf("The DISCARD PARTITION TABLESPACE clause is parsed but ignored by all storage engines."))
		parser.lastErrorAsWarn()
	}
|	"IMPORT" "TABLESPACE"
	{
		ret := &ast.AlterTableSpec{
			Tp: ast.AlterTableImportTablespace,
		}
		$$ = ret
		yylex.AppendError(yylex.Errorf("The IMPORT TABLESPACE clause is parsed but ignored by all storage engines."))
		parser.lastErrorAsWarn()
	}
|	"DISCARD" "TABLESPACE"
	{
		ret := &ast.AlterTableSpec{
			Tp: ast.AlterTableDiscardTablespace,
		}
		$$ = ret
		yylex.AppendError(yylex.Errorf("The DISCARD TABLESPACE clause is parsed but ignored by all storage engines."))
		parser.lastErrorAsWarn()
	}
|	"REBUILD" "PARTITION" NoWriteToBinLogAliasOpt AllOrPartitionNameList
	{
		ret := &ast.AlterTableSpec{
			Tp:              ast.AlterTableRebuildPartition,
			NoWriteToBinlog: $3.(bool),
		}
		if $4 == nil {
			ret.OnAllPartitions = true
		} else {
			ret.PartitionNames = $4.([]model.CIStr)
		}
		$$ = ret
	}
|	"DROP" KeyOrIndex IfExists Identifier
	{
		$$ = &ast.AlterTableSpec{
			IfExists: $3.(bool),
			Tp:       ast.AlterTableDropIndex,
			Name:     $4,
		}
	}
|	"DROP" "FOREIGN" "KEY" IfExists Symbol
	{
		$$ = &ast.AlterTableSpec{
			IfExists: $4.(bool),
			Tp:       ast.AlterTableDropForeignKey,
			Name:     $5,
		}
	}
|	"ORDER" "BY" AlterOrderList %prec lowerThenOrder
	{
		$$ = &ast.AlterTableSpec{
			Tp:          ast.AlterTableOrderByColumns,
			OrderByList: $3.([]*ast.AlterOrderItem),
		}
	}
|	"DISABLE" "KEYS"
	{
		$$ = &ast.AlterTableSpec{
			Tp: ast.AlterTableDisableKeys,
		}
	}
|	"ENABLE" "KEYS"
	{
		$$ = &ast.AlterTableSpec{
			Tp: ast.AlterTableEnableKeys,
		}
	}
|	"MODIFY" ColumnKeywordOpt IfExists ColumnDef ColumnPosition
	{
		$$ = &ast.AlterTableSpec{
			IfExists:   $3.(bool),
			Tp:         ast.AlterTableModifyColumn,
			NewColumns: []*ast.ColumnDef{$4.(*ast.ColumnDef)},
			Position:   $5.(*ast.ColumnPosition),
		}
	}
|	"CHANGE" ColumnKeywordOpt IfExists ColumnName ColumnDef ColumnPosition
	{
		$$ = &ast.AlterTableSpec{
			IfExists:      $3.(bool),
			Tp:            ast.AlterTableChangeColumn,
			OldColumnName: $4.(*ast.ColumnName),
			NewColumns:    []*ast.ColumnDef{$5.(*ast.ColumnDef)},
			Position:      $6.(*ast.ColumnPosition),
		}
	}
|	"ALTER" ColumnKeywordOpt ColumnName "SET" "DEFAULT" SignedLiteral
	{
		option := &ast.ColumnOption{Expr: $6}
		colDef := &ast.ColumnDef{
			Name:    $3.(*ast.ColumnName),
			Options: []*ast.ColumnOption{option},
		}
		$$ = &ast.AlterTableSpec{
			Tp:         ast.AlterTableAlterColumn,
			NewColumns: []*ast.ColumnDef{colDef},
		}
	}
|	"ALTER" ColumnKeywordOpt ColumnName "SET" "DEFAULT" '(' Expression ')'
	{
		option := &ast.ColumnOption{Expr: $7}
		colDef := &ast.ColumnDef{
			Name:    $3.(*ast.ColumnName),
			Options: []*ast.ColumnOption{option},
		}
		$$ = &ast.AlterTableSpec{
			Tp:         ast.AlterTableAlterColumn,
			NewColumns: []*ast.ColumnDef{colDef},
		}
	}
|	"ALTER" ColumnKeywordOpt ColumnName "DROP" "DEFAULT"
	{
		colDef := &ast.ColumnDef{
			Name: $3.(*ast.ColumnName),
		}
		$$ = &ast.AlterTableSpec{
			Tp:         ast.AlterTableAlterColumn,
			NewColumns: []*ast.ColumnDef{colDef},
		}
	}
|	"RENAME" "COLUMN" Identifier "TO" Identifier
	{
		oldColName := &ast.ColumnName{Name: model.NewCIStr($3)}
		newColName := &ast.ColumnName{Name: model.NewCIStr($5)}
		$$ = &ast.AlterTableSpec{
			Tp:            ast.AlterTableRenameColumn,
			OldColumnName: oldColName,
			NewColumnName: newColName,
		}
	}
|	"RENAME" "TO" TableName
	{
		$$ = &ast.AlterTableSpec{
			Tp:       ast.AlterTableRenameTable,
			NewTable: $3.(*ast.TableName),
		}
	}
|	"RENAME" EqOpt TableName
	{
		$$ = &ast.AlterTableSpec{
			Tp:       ast.AlterTableRenameTable,
			NewTable: $3.(*ast.TableName),
		}
	}
|	"RENAME" "AS" TableName
	{
		$$ = &ast.AlterTableSpec{
			Tp:       ast.AlterTableRenameTable,
			NewTable: $3.(*ast.TableName),
		}
	}
|	"RENAME" KeyOrIndex Identifier "TO" Identifier
	{
		$$ = &ast.AlterTableSpec{
			Tp:      ast.AlterTableRenameIndex,
			FromKey: model.NewCIStr($3),
			ToKey:   model.NewCIStr($5),
		}
	}
|	LockClause
	{
		$$ = &ast.AlterTableSpec{
			Tp:       ast.AlterTableLock,
			LockType: $1.(ast.LockType),
		}
	}
|	Writeable
	{
		$$ = &ast.AlterTableSpec{
			Tp:        ast.AlterTableWriteable,
			Writeable: $1.(bool),
		}
	}
|	AlgorithmClause
	{
		// Parse it and ignore it. Just for compatibility.
		$$ = &ast.AlterTableSpec{
			Tp:        ast.AlterTableAlgorithm,
			Algorithm: $1.(ast.AlgorithmType),
		}
	}
|	"FORCE"
	{
		// Parse it and ignore it. Just for compatibility.
		$$ = &ast.AlterTableSpec{
			Tp: ast.AlterTableForce,
		}
	}
|	"WITH" "VALIDATION"
	{
		// Parse it and ignore it. Just for compatibility.
		$$ = &ast.AlterTableSpec{
			Tp: ast.AlterTableWithValidation,
		}
	}
|	"WITHOUT" "VALIDATION"
	{
		// Parse it and ignore it. Just for compatibility.
		$$ = &ast.AlterTableSpec{
			Tp: ast.AlterTableWithoutValidation,
		}
	}
// Added in MySQL 8.0.13, see: https://dev.mysql.com/doc/refman/8.0/en/keywords.html for details
|	"SECONDARY_LOAD"
	{
		// Parse it and ignore it. Just for compatibility.
		$$ = &ast.AlterTableSpec{
			Tp: ast.AlterTableSecondaryLoad,
		}
		yylex.AppendError(yylex.Errorf("The SECONDARY_LOAD clause is parsed but not implement yet."))
		parser.lastErrorAsWarn()
	}
// Added in MySQL 8.0.13, see: https://dev.mysql.com/doc/refman/8.0/en/keywords.html for details
|	"SECONDARY_UNLOAD"
	{
		// Parse it and ignore it. Just for compatibility.
		$$ = &ast.AlterTableSpec{
			Tp: ast.AlterTableSecondaryUnload,
		}
		yylex.AppendError(yylex.Errorf("The SECONDARY_UNLOAD VALIDATION clause is parsed but not implement yet."))
		parser.lastErrorAsWarn()
	}
|	"ALTER" CheckConstraintKeyword Identifier EnforcedOrNot
	{
		c := &ast.Constraint{
			Name:     $3,
			Enforced: $4.(bool),
		}
		$$ = &ast.AlterTableSpec{
			Tp:         ast.AlterTableAlterCheck,
			Constraint: c,
		}
	}
|	"DROP" CheckConstraintKeyword Identifier
	{
		// Parse it and ignore it. Just for compatibility.
		c := &ast.Constraint{
			Name: $3,
		}
		$$ = &ast.AlterTableSpec{
			Tp:         ast.AlterTableDropCheck,
			Constraint: c,
		}
	}
|	"ALTER" "INDEX" Identifier IndexInvisible
	{
		$$ = &ast.AlterTableSpec{
			Tp:         ast.AlterTableIndexInvisible,
			IndexName:  model.NewCIStr($3),
			Visibility: $4.(ast.IndexVisibility),
		}
	}
|	PlacementSpecList %prec lowerThanComma
	{
		$$ = &ast.AlterTableSpec{
			Tp:             ast.AlterTablePlacement,
			PlacementSpecs: $1.([]*ast.PlacementSpec),
		}
	}

ReorganizePartitionRuleOpt:
	/* empty */ %prec lowerThanRemove
	{
		ret := &ast.AlterTableSpec{
			Tp:              ast.AlterTableReorganizePartition,
			OnAllPartitions: true,
		}
		$$ = ret
	}
|	PartitionNameList "INTO" '(' PartitionDefinitionList ')'
	{
		ret := &ast.AlterTableSpec{
			Tp:              ast.AlterTableReorganizePartition,
			PartitionNames:  $1.([]model.CIStr),
			PartDefinitions: $4.([]*ast.PartitionDefinition),
		}
		$$ = ret
	}

AllOrPartitionNameList:
	"ALL"
	{
		$$ = nil
	}
|	PartitionNameList %prec lowerThanComma

WithValidationOpt:
	{
		$$ = true
	}
|	WithValidation

WithValidation:
	"WITH" "VALIDATION"
	{
		$$ = true
	}
|	"WITHOUT" "VALIDATION"
	{
		$$ = false
	}

AlgorithmClause:
	"ALGORITHM" EqOpt "DEFAULT"
	{
		$$ = ast.AlgorithmTypeDefault
	}
|	"ALGORITHM" EqOpt "COPY"
	{
		$$ = ast.AlgorithmTypeCopy
	}
|	"ALGORITHM" EqOpt "INPLACE"
	{
		$$ = ast.AlgorithmTypeInplace
	}
|	"ALGORITHM" EqOpt "INSTANT"
	{
		$$ = ast.AlgorithmTypeInstant
	}
|	"ALGORITHM" EqOpt identifier
	{
		yylex.AppendError(ErrUnknownAlterAlgorithm.GenWithStackByArgs($1))
		return 1
	}

LockClause:
	"LOCK" EqOpt "DEFAULT"
	{
		$$ = ast.LockTypeDefault
	}
|	"LOCK" EqOpt Identifier
	{
		id := strings.ToUpper($3)

		if id == "NONE" {
			$$ = ast.LockTypeNone
		} else if id == "SHARED" {
			$$ = ast.LockTypeShared
		} else if id == "EXCLUSIVE" {
			$$ = ast.LockTypeExclusive
		} else {
			yylex.AppendError(ErrUnknownAlterLock.GenWithStackByArgs($3))
			return 1
		}
	}

Writeable:
	"READ" "WRITE"
	{
		$$ = true
	}
|	"READ" "ONLY"
	{
		$$ = false
	}

KeyOrIndex:
	"KEY"
|	"INDEX"

KeyOrIndexOpt:
	{}
|	KeyOrIndex

ColumnKeywordOpt:
	{}
|	"COLUMN"

ColumnPosition:
	{
		$$ = &ast.ColumnPosition{Tp: ast.ColumnPositionNone}
	}
|	"FIRST"
	{
		$$ = &ast.ColumnPosition{Tp: ast.ColumnPositionFirst}
	}
|	"AFTER" ColumnName
	{
		$$ = &ast.ColumnPosition{
			Tp:             ast.ColumnPositionAfter,
			RelativeColumn: $2.(*ast.ColumnName),
		}
	}

AlterTableSpecListOpt:
	/* empty */
	{
		$$ = make([]*ast.AlterTableSpec, 0, 1)
	}
|	AlterTableSpecList

AlterTableSpecList:
	AlterTableSpec
	{
		$$ = []*ast.AlterTableSpec{$1.(*ast.AlterTableSpec)}
	}
|	AlterTableSpecList ',' AlterTableSpec
	{
		$$ = append($1.([]*ast.AlterTableSpec), $3.(*ast.AlterTableSpec))
	}

PartitionNameList:
	Identifier
	{
		$$ = []model.CIStr{model.NewCIStr($1)}
	}
|	PartitionNameList ',' Identifier
	{
		$$ = append($1.([]model.CIStr), model.NewCIStr($3))
	}

ConstraintKeywordOpt:
	{
		$$ = nil
	}
|	"CONSTRAINT"
	{
		$$ = nil
	}
|	"CONSTRAINT" Symbol
	{
		$$ = $2
	}

Symbol:
	Identifier

/**************************************RenameTableStmt***************************************
 * See http://dev.mysql.com/doc/refman/5.7/en/rename-table.html
 *
 * RENAME TABLE
 *     tbl_name TO new_tbl_name
 *     [, tbl_name2 TO new_tbl_name2] ...
 *******************************************************************************************/
RenameTableStmt:
	"RENAME" "TABLE" TableToTableList
	{
		$$ = &ast.RenameTableStmt{
			TableToTables: $3.([]*ast.TableToTable),
		}
	}

TableToTableList:
	TableToTable
	{
		$$ = []*ast.TableToTable{$1.(*ast.TableToTable)}
	}
|	TableToTableList ',' TableToTable
	{
		$$ = append($1.([]*ast.TableToTable), $3.(*ast.TableToTable))
	}

TableToTable:
	TableName "TO" TableName
	{
		$$ = &ast.TableToTable{
			OldTable: $1.(*ast.TableName),
			NewTable: $3.(*ast.TableName),
		}
	}

/*******************************************************************
 *
 *  Recover Table Statement
 *
 *  Example:
 *      RECOVER TABLE t1;
 *      RECOVER TABLE BY JOB 100;
 *
 *******************************************************************/
RecoverTableStmt:
	"RECOVER" "TABLE" "BY" "JOB" Int64Num
	{
		$$ = &ast.RecoverTableStmt{
			JobID: $5.(int64),
		}
	}
|	"RECOVER" "TABLE" TableName
	{
		$$ = &ast.RecoverTableStmt{
			Table: $3.(*ast.TableName),
		}
	}
|	"RECOVER" "TABLE" TableName Int64Num
	{
		$$ = &ast.RecoverTableStmt{
			Table:  $3.(*ast.TableName),
			JobNum: $4.(int64),
		}
	}

/*******************************************************************
 *
 *  Flush Back Table Statement
 *
 *  Example:
 *
 *******************************************************************/
FlashbackTableStmt:
	"FLASHBACK" "TABLE" TableName FlashbackToNewName
	{
		$$ = &ast.FlashBackTableStmt{
			Table:   $3.(*ast.TableName),
			NewName: $4,
		}
	}

FlashbackToNewName:
	{
		$$ = ""
	}
|	"TO" Identifier
	{
		$$ = $2
	}

/*******************************************************************
 *
 *  Split index region statement
 *
 *  Example:
 *      SPLIT TABLE table_name INDEX index_name BY (val1...),(val2...)...
 *
 *******************************************************************/
SplitRegionStmt:
	"SPLIT" SplitSyntaxOption "TABLE" TableName PartitionNameListOpt SplitOption
	{
		$$ = &ast.SplitRegionStmt{
			SplitSyntaxOpt: $2.(*ast.SplitSyntaxOption),
			Table:          $4.(*ast.TableName),
			PartitionNames: $5.([]model.CIStr),
			SplitOpt:       $6.(*ast.SplitOption),
		}
	}
|	"SPLIT" SplitSyntaxOption "TABLE" TableName PartitionNameListOpt "INDEX" Identifier SplitOption
	{
		$$ = &ast.SplitRegionStmt{
			SplitSyntaxOpt: $2.(*ast.SplitSyntaxOption),
			Table:          $4.(*ast.TableName),
			PartitionNames: $5.([]model.CIStr),
			IndexName:      model.NewCIStr($7),
			SplitOpt:       $8.(*ast.SplitOption),
		}
	}

SplitOption:
	"BETWEEN" RowValue "AND" RowValue "REGIONS" Int64Num
	{
		$$ = &ast.SplitOption{
			Lower: $2.([]ast.ExprNode),
			Upper: $4.([]ast.ExprNode),
			Num:   $6.(int64),
		}
	}
|	"BY" ValuesList
	{
		$$ = &ast.SplitOption{
			ValueLists: $2.([][]ast.ExprNode),
		}
	}

SplitSyntaxOption:
	/* empty */
	{
		$$ = &ast.SplitSyntaxOption{}
	}
|	"REGION" "FOR"
	{
		$$ = &ast.SplitSyntaxOption{
			HasRegionFor: true,
		}
	}
|	"PARTITION"
	{
		$$ = &ast.SplitSyntaxOption{
			HasPartition: true,
		}
	}
|	"REGION" "FOR" "PARTITION"
	{
		$$ = &ast.SplitSyntaxOption{
			HasRegionFor: true,
			HasPartition: true,
		}
	}

AnalyzeTableStmt:
	"ANALYZE" "TABLE" TableNameList AnalyzeOptionListOpt
	{
		$$ = &ast.AnalyzeTableStmt{TableNames: $3.([]*ast.TableName), AnalyzeOpts: $4.([]ast.AnalyzeOpt)}
	}
|	"ANALYZE" "TABLE" TableName "INDEX" IndexNameList AnalyzeOptionListOpt
	{
		$$ = &ast.AnalyzeTableStmt{TableNames: []*ast.TableName{$3.(*ast.TableName)}, IndexNames: $5.([]model.CIStr), IndexFlag: true, AnalyzeOpts: $6.([]ast.AnalyzeOpt)}
	}
|	"ANALYZE" "INCREMENTAL" "TABLE" TableName "INDEX" IndexNameList AnalyzeOptionListOpt
	{
		$$ = &ast.AnalyzeTableStmt{TableNames: []*ast.TableName{$4.(*ast.TableName)}, IndexNames: $6.([]model.CIStr), IndexFlag: true, Incremental: true, AnalyzeOpts: $7.([]ast.AnalyzeOpt)}
	}
|	"ANALYZE" "TABLE" TableName "PARTITION" PartitionNameList AnalyzeOptionListOpt
	{
		$$ = &ast.AnalyzeTableStmt{TableNames: []*ast.TableName{$3.(*ast.TableName)}, PartitionNames: $5.([]model.CIStr), AnalyzeOpts: $6.([]ast.AnalyzeOpt)}
	}
|	"ANALYZE" "TABLE" TableName "PARTITION" PartitionNameList "INDEX" IndexNameList AnalyzeOptionListOpt
	{
		$$ = &ast.AnalyzeTableStmt{
			TableNames:     []*ast.TableName{$3.(*ast.TableName)},
			PartitionNames: $5.([]model.CIStr),
			IndexNames:     $7.([]model.CIStr),
			IndexFlag:      true,
			AnalyzeOpts:    $8.([]ast.AnalyzeOpt),
		}
	}
|	"ANALYZE" "INCREMENTAL" "TABLE" TableName "PARTITION" PartitionNameList "INDEX" IndexNameList AnalyzeOptionListOpt
	{
		$$ = &ast.AnalyzeTableStmt{
			TableNames:     []*ast.TableName{$4.(*ast.TableName)},
			PartitionNames: $6.([]model.CIStr),
			IndexNames:     $8.([]model.CIStr),
			IndexFlag:      true,
			Incremental:    true,
			AnalyzeOpts:    $9.([]ast.AnalyzeOpt),
		}
	}
|	"ANALYZE" "TABLE" TableName "UPDATE" "HISTOGRAM" "ON" ColumnNameList AnalyzeOptionListOpt
	{
		$$ = &ast.AnalyzeTableStmt{
			TableNames:         []*ast.TableName{$3.(*ast.TableName)},
			ColumnNames:        $7.([]*ast.ColumnName),
			AnalyzeOpts:        $8.([]ast.AnalyzeOpt),
			HistogramOperation: ast.HistogramOperationUpdate,
		}
	}
|	"ANALYZE" "TABLE" TableName "DROP" "HISTOGRAM" "ON" ColumnNameList
	{
		$$ = &ast.AnalyzeTableStmt{
			TableNames:         []*ast.TableName{$3.(*ast.TableName)},
			ColumnNames:        $7.([]*ast.ColumnName),
			HistogramOperation: ast.HistogramOperationDrop,
		}
	}

AnalyzeOptionListOpt:
	{
		$$ = []ast.AnalyzeOpt{}
	}
|	"WITH" AnalyzeOptionList
	{
		$$ = $2.([]ast.AnalyzeOpt)
	}

AnalyzeOptionList:
	AnalyzeOption
	{
		$$ = []ast.AnalyzeOpt{$1.(ast.AnalyzeOpt)}
	}
|	AnalyzeOptionList ',' AnalyzeOption
	{
		$$ = append($1.([]ast.AnalyzeOpt), $3.(ast.AnalyzeOpt))
	}

AnalyzeOption:
	NUM "BUCKETS"
	{
		$$ = ast.AnalyzeOpt{Type: ast.AnalyzeOptNumBuckets, Value: getUint64FromNUM($1)}
	}
|	NUM "TOPN"
	{
		$$ = ast.AnalyzeOpt{Type: ast.AnalyzeOptNumTopN, Value: getUint64FromNUM($1)}
	}
|	NUM "CMSKETCH" "DEPTH"
	{
		$$ = ast.AnalyzeOpt{Type: ast.AnalyzeOptCMSketchDepth, Value: getUint64FromNUM($1)}
	}
|	NUM "CMSKETCH" "WIDTH"
	{
		$$ = ast.AnalyzeOpt{Type: ast.AnalyzeOptCMSketchWidth, Value: getUint64FromNUM($1)}
	}
|	NUM "SAMPLES"
	{
		$$ = ast.AnalyzeOpt{Type: ast.AnalyzeOptNumSamples, Value: getUint64FromNUM($1)}
	}

/*******************************************************************************************/
Assignment:
	ColumnName eq ExprOrDefault
	{
		$$ = &ast.Assignment{Column: $1.(*ast.ColumnName), Expr: $3}
	}

AssignmentList:
	Assignment
	{
		$$ = []*ast.Assignment{$1.(*ast.Assignment)}
	}
|	AssignmentList ',' Assignment
	{
		$$ = append($1.([]*ast.Assignment), $3.(*ast.Assignment))
	}

AssignmentListOpt:
	/* EMPTY */
	{
		$$ = []*ast.Assignment{}
	}
|	AssignmentList

BeginTransactionStmt:
	"BEGIN"
	{
		$$ = &ast.BeginStmt{}
	}
|	"BEGIN" "PESSIMISTIC"
	{
		$$ = &ast.BeginStmt{
			Mode: ast.Pessimistic,
		}
	}
|	"BEGIN" "OPTIMISTIC"
	{
		$$ = &ast.BeginStmt{
			Mode: ast.Optimistic,
		}
	}
|	"START" "TRANSACTION"
	{
		$$ = &ast.BeginStmt{}
	}
|	"START" "TRANSACTION" "READ" "WRITE"
	{
		$$ = &ast.BeginStmt{}
	}
|	"START" "TRANSACTION" "WITH" "CONSISTENT" "SNAPSHOT"
	{
		$$ = &ast.BeginStmt{}
	}
|	"START" "TRANSACTION" "READ" "ONLY"
	{
		$$ = &ast.BeginStmt{
			ReadOnly: true,
		}
	}
|	"START" "TRANSACTION" "READ" "ONLY" "WITH" "TIMESTAMP" "BOUND" TimestampBound
	{
		$$ = &ast.BeginStmt{
			ReadOnly: true,
			Bound:    $8.(*ast.TimestampBound),
		}
	}

TimestampBound:
	"STRONG"
	{
		$$ = &ast.TimestampBound{
			Mode: ast.TimestampBoundStrong,
		}
	}
|	"READ" "TIMESTAMP" Expression
	{
		$$ = &ast.TimestampBound{
			Mode:      ast.TimestampBoundReadTimestamp,
			Timestamp: $3.(ast.ExprNode),
		}
	}
|	"MIN" "READ" "TIMESTAMP" Expression
	{
		$$ = &ast.TimestampBound{
			Mode:      ast.TimestampBoundMinReadTimestamp,
			Timestamp: $4.(ast.ExprNode),
		}
	}
|	"MAX" "STALENESS" Expression
	{
		$$ = &ast.TimestampBound{
			Mode:      ast.TimestampBoundMaxStaleness,
			Timestamp: $3.(ast.ExprNode),
		}
	}
|	"EXACT" "STALENESS" Expression
	{
		$$ = &ast.TimestampBound{
			Mode:      ast.TimestampBoundExactStaleness,
			Timestamp: $3.(ast.ExprNode),
		}
	}

BinlogStmt:
	"BINLOG" stringLit
	{
		$$ = &ast.BinlogStmt{Str: $2}
	}

ColumnDefList:
	ColumnDef
	{
		$$ = []*ast.ColumnDef{$1.(*ast.ColumnDef)}
	}
|	ColumnDefList ',' ColumnDef
	{
		$$ = append($1.([]*ast.ColumnDef), $3.(*ast.ColumnDef))
	}

ColumnDef:
	ColumnName Type ColumnOptionListOpt
	{
		colDef := &ast.ColumnDef{Name: $1.(*ast.ColumnName), Tp: $2.(*types.FieldType), Options: $3.([]*ast.ColumnOption)}
		if !colDef.Validate() {
			yylex.AppendError(yylex.Errorf("Invalid column definition"))
			return 1
		}
		$$ = colDef
	}
|	ColumnName "SERIAL" ColumnOptionListOpt
	{
		// TODO: check flen 0
		tp := types.NewFieldType(mysql.TypeLonglong)
		options := []*ast.ColumnOption{{Tp: ast.ColumnOptionNotNull}, {Tp: ast.ColumnOptionAutoIncrement}, {Tp: ast.ColumnOptionUniqKey}}
		options = append(options, $3.([]*ast.ColumnOption)...)
		tp.Flag |= mysql.UnsignedFlag
		colDef := &ast.ColumnDef{Name: $1.(*ast.ColumnName), Tp: tp, Options: options}
		if !colDef.Validate() {
			yylex.AppendError(yylex.Errorf("Invalid column definition"))
			return 1
		}
		$$ = colDef
	}

ColumnName:
	Identifier
	{
		$$ = &ast.ColumnName{Name: model.NewCIStr($1)}
	}
|	Identifier '.' Identifier
	{
		$$ = &ast.ColumnName{Table: model.NewCIStr($1), Name: model.NewCIStr($3)}
	}
|	Identifier '.' Identifier '.' Identifier
	{
		$$ = &ast.ColumnName{Schema: model.NewCIStr($1), Table: model.NewCIStr($3), Name: model.NewCIStr($5)}
	}

ColumnNameList:
	ColumnName
	{
		$$ = []*ast.ColumnName{$1.(*ast.ColumnName)}
	}
|	ColumnNameList ',' ColumnName
	{
		$$ = append($1.([]*ast.ColumnName), $3.(*ast.ColumnName))
	}

ColumnNameListOpt:
	/* EMPTY */
	{
		$$ = []*ast.ColumnName{}
	}
|	ColumnNameList

ColumnNameOrUserVarListOpt:
	/* EMPTY */
	{
		$$ = []*ast.ColumnNameOrUserVar{}
	}
|	ColumnNameOrUserVariableList

ColumnNameOrUserVariableList:
	ColumnNameOrUserVariable
	{
		$$ = []*ast.ColumnNameOrUserVar{$1.(*ast.ColumnNameOrUserVar)}
	}
|	ColumnNameOrUserVariableList ',' ColumnNameOrUserVariable
	{
		$$ = append($1.([]*ast.ColumnNameOrUserVar), $3.(*ast.ColumnNameOrUserVar))
	}

ColumnNameOrUserVariable:
	ColumnName
	{
		$$ = &ast.ColumnNameOrUserVar{ColumnName: $1.(*ast.ColumnName)}
	}
|	UserVariable
	{
		$$ = &ast.ColumnNameOrUserVar{UserVar: $1.(*ast.VariableExpr)}
	}

ColumnNameOrUserVarListOptWithBrackets:
	/* EMPTY */
	{
		$$ = []*ast.ColumnNameOrUserVar{}
	}
|	'(' ColumnNameOrUserVarListOpt ')'
	{
		$$ = $2.([]*ast.ColumnNameOrUserVar)
	}

CommitStmt:
	"COMMIT"
	{
		$$ = &ast.CommitStmt{}
	}
|	"COMMIT" CompletionTypeWithinTransaction
	{
		$$ = &ast.CommitStmt{CompletionType: $2.(ast.CompletionType)}
	}

PrimaryOpt:
	{}
|	"PRIMARY"

NotSym:
	not
|	not2
	{
		$$ = "NOT"
	}

EnforcedOrNot:
	"ENFORCED"
	{
		$$ = true
	}
|	NotSym "ENFORCED"
	{
		$$ = false
	}

EnforcedOrNotOpt:
	%prec lowerThanNot
	{
		$$ = true
	}
|	EnforcedOrNot

EnforcedOrNotOrNotNullOpt:
	//	 This branch is needed to workaround the need of a lookahead of 2 for the grammar:
	//
	//	  { [NOT] NULL | CHECK(...) [NOT] ENFORCED } ...
	NotSym "NULL"
	{
		$$ = 0
	}
|	EnforcedOrNotOpt
	{
		if $1.(bool) {
			$$ = 1
		} else {
			$$ = 2
		}
	}

ColumnOption:
	NotSym "NULL"
	{
		$$ = &ast.ColumnOption{Tp: ast.ColumnOptionNotNull}
	}
|	"NULL"
	{
		$$ = &ast.ColumnOption{Tp: ast.ColumnOptionNull}
	}
|	"AUTO_INCREMENT"
	{
		$$ = &ast.ColumnOption{Tp: ast.ColumnOptionAutoIncrement}
	}
|	PrimaryOpt "KEY"
	{
		// KEY is normally a synonym for INDEX. The key attribute PRIMARY KEY
		// can also be specified as just KEY when given in a column definition.
		// See http://dev.mysql.com/doc/refman/5.7/en/create-table.html
		$$ = &ast.ColumnOption{Tp: ast.ColumnOptionPrimaryKey}
	}
|	"UNIQUE" %prec lowerThanKey
	{
		$$ = &ast.ColumnOption{Tp: ast.ColumnOptionUniqKey}
	}
|	"UNIQUE" "KEY"
	{
		$$ = &ast.ColumnOption{Tp: ast.ColumnOptionUniqKey}
	}
|	"DEFAULT" DefaultValueExpr
	{
		$$ = &ast.ColumnOption{Tp: ast.ColumnOptionDefaultValue, Expr: $2}
	}
|	"SERIAL" "DEFAULT" "VALUE"
	{
		$$ = []*ast.ColumnOption{{Tp: ast.ColumnOptionNotNull}, {Tp: ast.ColumnOptionAutoIncrement}, {Tp: ast.ColumnOptionUniqKey}}
	}
|	"ON" "UPDATE" NowSymOptionFraction
	{
		$$ = &ast.ColumnOption{Tp: ast.ColumnOptionOnUpdate, Expr: $3}
	}
|	"COMMENT" stringLit
	{
		$$ = &ast.ColumnOption{Tp: ast.ColumnOptionComment, Expr: ast.NewValueExpr($2, "", "")}
	}
|	ConstraintKeywordOpt "CHECK" '(' Expression ')' EnforcedOrNotOrNotNullOpt
	{
		// See https://dev.mysql.com/doc/refman/5.7/en/create-table.html
		// The CHECK clause is parsed but ignored by all storage engines.
		// See the branch named `EnforcedOrNotOrNotNullOpt`.

		optionCheck := &ast.ColumnOption{
			Tp:       ast.ColumnOptionCheck,
			Expr:     $4,
			Enforced: true,
		}
		// Keep the column type check constraint name.
		if $1 != nil {
			optionCheck.ConstraintName = $1.(string)
		}
		switch $6.(int) {
		case 0:
			$$ = []*ast.ColumnOption{optionCheck, {Tp: ast.ColumnOptionNotNull}}
		case 1:
			optionCheck.Enforced = true
			$$ = optionCheck
		case 2:
			optionCheck.Enforced = false
			$$ = optionCheck
		default:
		}
	}
|	GeneratedAlways "AS" '(' Expression ')' VirtualOrStored
	{
		startOffset := parser.startOffset(&yyS[yypt-2])
		endOffset := parser.endOffset(&yyS[yypt-1])
		expr := $4
		expr.SetText(parser.src[startOffset:endOffset])

		$$ = &ast.ColumnOption{
			Tp:     ast.ColumnOptionGenerated,
			Expr:   expr,
			Stored: $6.(bool),
		}
	}
|	ReferDef
	{
		$$ = &ast.ColumnOption{
			Tp:    ast.ColumnOptionReference,
			Refer: $1.(*ast.ReferenceDef),
		}
	}
|	"COLLATE" CollationName
	{
		$$ = &ast.ColumnOption{Tp: ast.ColumnOptionCollate, StrValue: $2}
	}
|	"COLUMN_FORMAT" ColumnFormat
	{
		$$ = &ast.ColumnOption{Tp: ast.ColumnOptionColumnFormat, StrValue: $2}
	}
|	"STORAGE" StorageMedia
	{
		$$ = &ast.ColumnOption{Tp: ast.ColumnOptionStorage, StrValue: $2}
		yylex.AppendError(yylex.Errorf("The STORAGE clause is parsed but ignored by all storage engines."))
		parser.lastErrorAsWarn()
	}
|	"AUTO_RANDOM" OptFieldLen
	{
		$$ = &ast.ColumnOption{Tp: ast.ColumnOptionAutoRandom, AutoRandomBitLength: $2.(int)}
	}

StorageMedia:
	"DEFAULT"
|	"DISK"
|	"MEMORY"

ColumnFormat:
	"DEFAULT"
	{
		$$ = "DEFAULT"
	}
|	"FIXED"
	{
		$$ = "FIXED"
	}
|	"DYNAMIC"
	{
		$$ = "DYNAMIC"
	}

GeneratedAlways:

|	"GENERATED" "ALWAYS"

VirtualOrStored:
	{
		$$ = false
	}
|	"VIRTUAL"
	{
		$$ = false
	}
|	"STORED"
	{
		$$ = true
	}

ColumnOptionList:
	ColumnOption
	{
		if columnOption, ok := $1.(*ast.ColumnOption); ok {
			$$ = []*ast.ColumnOption{columnOption}
		} else {
			$$ = $1
		}
	}
|	ColumnOptionList ColumnOption
	{
		if columnOption, ok := $2.(*ast.ColumnOption); ok {
			$$ = append($1.([]*ast.ColumnOption), columnOption)
		} else {
			$$ = append($1.([]*ast.ColumnOption), $2.([]*ast.ColumnOption)...)
		}
	}

ColumnOptionListOpt:
	{
		$$ = []*ast.ColumnOption{}
	}
|	ColumnOptionList

ConstraintElem:
	"PRIMARY" "KEY" IndexNameAndTypeOpt '(' IndexPartSpecificationList ')' IndexOptionList
	{
		c := &ast.Constraint{
			Tp:           ast.ConstraintPrimaryKey,
			Keys:         $5.([]*ast.IndexPartSpecification),
			Name:         $3.([]interface{})[0].(*ast.NullString).String,
			IsEmptyIndex: $3.([]interface{})[0].(*ast.NullString).Empty,
		}
		if $7 != nil {
			c.Option = $7.(*ast.IndexOption)
		}
		if indexType := $3.([]interface{})[1]; indexType != nil {
			if c.Option == nil {
				c.Option = &ast.IndexOption{}
			}
			c.Option.Tp = indexType.(model.IndexType)
		}
		$$ = c
	}
|	"FULLTEXT" KeyOrIndexOpt IndexName '(' IndexPartSpecificationList ')' IndexOptionList
	{
		c := &ast.Constraint{
			Tp:           ast.ConstraintFulltext,
			Keys:         $5.([]*ast.IndexPartSpecification),
			Name:         $3.(*ast.NullString).String,
			IsEmptyIndex: $3.(*ast.NullString).Empty,
		}
		if $7 != nil {
			c.Option = $7.(*ast.IndexOption)
		}
		$$ = c
	}
|	KeyOrIndex IfNotExists IndexNameAndTypeOpt '(' IndexPartSpecificationList ')' IndexOptionList
	{
		c := &ast.Constraint{
			IfNotExists:  $2.(bool),
			Tp:           ast.ConstraintIndex,
			Keys:         $5.([]*ast.IndexPartSpecification),
			Name:         $3.([]interface{})[0].(*ast.NullString).String,
			IsEmptyIndex: $3.([]interface{})[0].(*ast.NullString).Empty,
		}
		if $7 != nil {
			c.Option = $7.(*ast.IndexOption)
		}
		if indexType := $3.([]interface{})[1]; indexType != nil {
			if c.Option == nil {
				c.Option = &ast.IndexOption{}
			}
			c.Option.Tp = indexType.(model.IndexType)
		}
		$$ = c
	}
|	"UNIQUE" KeyOrIndexOpt IndexNameAndTypeOpt '(' IndexPartSpecificationList ')' IndexOptionList
	{
		c := &ast.Constraint{
			Tp:           ast.ConstraintUniq,
			Keys:         $5.([]*ast.IndexPartSpecification),
			Name:         $3.([]interface{})[0].(*ast.NullString).String,
			IsEmptyIndex: $3.([]interface{})[0].(*ast.NullString).Empty,
		}
		if $7 != nil {
			c.Option = $7.(*ast.IndexOption)
		}

		if indexType := $3.([]interface{})[1]; indexType != nil {
			if c.Option == nil {
				c.Option = &ast.IndexOption{}
			}
			c.Option.Tp = indexType.(model.IndexType)
		}
		$$ = c
	}
|	"FOREIGN" "KEY" IfNotExists IndexName '(' IndexPartSpecificationList ')' ReferDef
	{
		$$ = &ast.Constraint{
			IfNotExists:  $3.(bool),
			Tp:           ast.ConstraintForeignKey,
			Keys:         $6.([]*ast.IndexPartSpecification),
			Name:         $4.(*ast.NullString).String,
			Refer:        $8.(*ast.ReferenceDef),
			IsEmptyIndex: $4.(*ast.NullString).Empty,
		}
	}
|	"CHECK" '(' Expression ')' EnforcedOrNotOpt
	{
		$$ = &ast.Constraint{
			Tp:       ast.ConstraintCheck,
			Expr:     $3.(ast.ExprNode),
			Enforced: $5.(bool),
		}
	}

Match:
	"MATCH" "FULL"
	{
		$$ = ast.MatchFull
	}
|	"MATCH" "PARTIAL"
	{
		$$ = ast.MatchPartial
	}
|	"MATCH" "SIMPLE"
	{
		$$ = ast.MatchSimple
	}

MatchOpt:
	{
		$$ = ast.MatchNone
	}
|	Match
	{
		$$ = $1
		yylex.AppendError(yylex.Errorf("The MATCH clause is parsed but ignored by all storage engines."))
		parser.lastErrorAsWarn()
	}

ReferDef:
	"REFERENCES" TableName IndexPartSpecificationListOpt MatchOpt OnDeleteUpdateOpt
	{
		onDeleteUpdate := $5.([2]interface{})
		$$ = &ast.ReferenceDef{
			Table:                   $2.(*ast.TableName),
			IndexPartSpecifications: $3.([]*ast.IndexPartSpecification),
			OnDelete:                onDeleteUpdate[0].(*ast.OnDeleteOpt),
			OnUpdate:                onDeleteUpdate[1].(*ast.OnUpdateOpt),
			Match:                   $4.(ast.MatchType),
		}
	}

OnDelete:
	"ON" "DELETE" ReferOpt
	{
		$$ = &ast.OnDeleteOpt{ReferOpt: $3.(ast.ReferOptionType)}
	}

OnUpdate:
	"ON" "UPDATE" ReferOpt
	{
		$$ = &ast.OnUpdateOpt{ReferOpt: $3.(ast.ReferOptionType)}
	}

OnDeleteUpdateOpt:
	%prec lowerThanOn
	{
		$$ = [2]interface{}{&ast.OnDeleteOpt{}, &ast.OnUpdateOpt{}}
	}
|	OnDelete %prec lowerThanOn
	{
		$$ = [2]interface{}{$1, &ast.OnUpdateOpt{}}
	}
|	OnUpdate %prec lowerThanOn
	{
		$$ = [2]interface{}{&ast.OnDeleteOpt{}, $1}
	}
|	OnDelete OnUpdate
	{
		$$ = [2]interface{}{$1, $2}
	}
|	OnUpdate OnDelete
	{
		$$ = [2]interface{}{$2, $1}
	}

ReferOpt:
	"RESTRICT"
	{
		$$ = ast.ReferOptionRestrict
	}
|	"CASCADE"
	{
		$$ = ast.ReferOptionCascade
	}
|	"SET" "NULL"
	{
		$$ = ast.ReferOptionSetNull
	}
|	"NO" "ACTION"
	{
		$$ = ast.ReferOptionNoAction
	}
|	"SET" "DEFAULT"
	{
		$$ = ast.ReferOptionSetDefault
		yylex.AppendError(yylex.Errorf("The SET DEFAULT clause is parsed but ignored by all storage engines."))
		parser.lastErrorAsWarn()
	}

/*
 * The DEFAULT clause specifies a default value for a column.
 * With one exception, the default value must be a constant;
 * it cannot be a function or an expression. This means, for example,
 * that you cannot set the default for a date column to be the value of
 * a function such as NOW() or CURRENT_DATE. The exception is that you
 * can specify CURRENT_TIMESTAMP as the default for a TIMESTAMP or DATETIME column.
 *
 * See http://dev.mysql.com/doc/refman/5.7/en/create-table.html
 *      https://github.com/mysql/mysql-server/blob/5.7/sql/sql_yacc.yy#L6832
 */
DefaultValueExpr:
	NowSymOptionFraction
|	SignedLiteral
|	NextValueForSequence

NowSymOptionFraction:
	NowSym
	{
		$$ = &ast.FuncCallExpr{FnName: model.NewCIStr("CURRENT_TIMESTAMP")}
	}
|	NowSymFunc '(' ')'
	{
		$$ = &ast.FuncCallExpr{FnName: model.NewCIStr("CURRENT_TIMESTAMP")}
	}
|	NowSymFunc '(' NUM ')'
	{
		$$ = &ast.FuncCallExpr{FnName: model.NewCIStr("CURRENT_TIMESTAMP"), Args: []ast.ExprNode{ast.NewValueExpr($3, parser.charset, parser.collation)}}
	}

NextValueForSequence:
	"NEXT" "VALUE" forKwd TableName
	{
		objNameExpr := &ast.TableNameExpr{
			Name: $4.(*ast.TableName),
		}
		$$ = &ast.FuncCallExpr{
			FnName: model.NewCIStr(ast.NextVal),
			Args:   []ast.ExprNode{objNameExpr},
		}
	}
|	"NEXTVAL" '(' TableName ')'
	{
		objNameExpr := &ast.TableNameExpr{
			Name: $3.(*ast.TableName),
		}
		$$ = &ast.FuncCallExpr{
			FnName: model.NewCIStr(ast.NextVal),
			Args:   []ast.ExprNode{objNameExpr},
		}
	}

/*
* See https://dev.mysql.com/doc/refman/5.7/en/date-and-time-functions.html#function_localtime
* TODO: Process other three keywords
*/
NowSymFunc:
	"CURRENT_TIMESTAMP"
|	"LOCALTIME"
|	"LOCALTIMESTAMP"
|	builtinNow

NowSym:
	"CURRENT_TIMESTAMP"
|	"LOCALTIME"
|	"LOCALTIMESTAMP"

SignedLiteral:
	Literal
	{
		$$ = ast.NewValueExpr($1, parser.charset, parser.collation)
	}
|	'+' NumLiteral
	{
		$$ = &ast.UnaryOperationExpr{Op: opcode.Plus, V: ast.NewValueExpr($2, parser.charset, parser.collation)}
	}
|	'-' NumLiteral
	{
		$$ = &ast.UnaryOperationExpr{Op: opcode.Minus, V: ast.NewValueExpr($2, parser.charset, parser.collation)}
	}

NumLiteral:
	intLit
|	floatLit
|	decLit

StatsType:
	"CARDINALITY"
	{
		$$ = ast.StatsTypeCardinality
	}
|	"DEPENDENCY"
	{
		$$ = ast.StatsTypeDependency
	}
|	"CORRELATION"
	{
		$$ = ast.StatsTypeCorrelation
	}

CreateStatisticsStmt:
	"CREATE" "STATISTICS" IfNotExists Identifier '(' StatsType ')' "ON" TableName '(' ColumnNameList ')'
	{
		$$ = &ast.CreateStatisticsStmt{
			IfNotExists: $3.(bool),
			StatsName:   $4,
			StatsType:   $6.(uint8),
			Table:       $9.(*ast.TableName),
			Columns:     $11.([]*ast.ColumnName),
		}
	}

DropStatisticsStmt:
	"DROP" "STATISTICS" Identifier
	{
		$$ = &ast.DropStatisticsStmt{StatsName: $3}
	}

/**************************************CreateIndexStmt***************************************
 * See https://dev.mysql.com/doc/refman/8.0/en/create-index.html
 *
 * TYPE type_name is recognized as a synonym for USING type_name. However, USING is the preferred form.
 *
 * CREATE [UNIQUE | FULLTEXT | SPATIAL] INDEX index_name
 *     [index_type]
 *     ON tbl_name (key_part,...)
 *     [index_option]
 *     [algorithm_option | lock_option] ...
 *
 * key_part: {col_name [(length)] | (expr)} [ASC | DESC]
 *
 * index_option:
 *     KEY_BLOCK_SIZE [=] value
 *   | index_type
 *   | WITH PARSER parser_name
 *   | COMMENT 'string'
 *   | {VISIBLE | INVISIBLE}
 *
 * index_type:
 *     USING {BTREE | HASH}
 *
 * algorithm_option:
 *     ALGORITHM [=] {DEFAULT | INPLACE | COPY}
 *
 * lock_option:
 *     LOCK [=] {DEFAULT | NONE | SHARED | EXCLUSIVE}
 *******************************************************************************************/
CreateIndexStmt:
	"CREATE" IndexKeyTypeOpt "INDEX" IfNotExists Identifier IndexTypeOpt "ON" TableName '(' IndexPartSpecificationList ')' IndexOptionList IndexLockAndAlgorithmOpt
	{
		var indexOption *ast.IndexOption
		if $12 != nil {
			indexOption = $12.(*ast.IndexOption)
			if indexOption.Tp == model.IndexTypeInvalid {
				if $6 != nil {
					indexOption.Tp = $6.(model.IndexType)
				}
			}
		} else {
			indexOption = &ast.IndexOption{}
			if $6 != nil {
				indexOption.Tp = $6.(model.IndexType)
			}
		}
		var indexLockAndAlgorithm *ast.IndexLockAndAlgorithm
		if $13 != nil {
			indexLockAndAlgorithm = $13.(*ast.IndexLockAndAlgorithm)
			if indexLockAndAlgorithm.LockTp == ast.LockTypeDefault && indexLockAndAlgorithm.AlgorithmTp == ast.AlgorithmTypeDefault {
				indexLockAndAlgorithm = nil
			}
		}
		$$ = &ast.CreateIndexStmt{
			IfNotExists:             $4.(bool),
			IndexName:               $5,
			Table:                   $8.(*ast.TableName),
			IndexPartSpecifications: $10.([]*ast.IndexPartSpecification),
			IndexOption:             indexOption,
			KeyType:                 $2.(ast.IndexKeyType),
			LockAlg:                 indexLockAndAlgorithm,
		}
	}

IndexPartSpecificationListOpt:
	{
		$$ = ([]*ast.IndexPartSpecification)(nil)
	}
|	'(' IndexPartSpecificationList ')'
	{
		$$ = $2
	}

IndexPartSpecificationList:
	IndexPartSpecification
	{
		$$ = []*ast.IndexPartSpecification{$1.(*ast.IndexPartSpecification)}
	}
|	IndexPartSpecificationList ',' IndexPartSpecification
	{
		$$ = append($1.([]*ast.IndexPartSpecification), $3.(*ast.IndexPartSpecification))
	}

IndexPartSpecification:
	ColumnName OptFieldLen OptOrder
	{
		// Order is parsed but just ignored as MySQL did.
		$$ = &ast.IndexPartSpecification{Column: $1.(*ast.ColumnName), Length: $2.(int)}
	}
|	'(' Expression ')' OptOrder
	{
		$$ = &ast.IndexPartSpecification{Expr: $2}
	}

IndexLockAndAlgorithmOpt:
	{
		$$ = nil
	}
|	LockClause
	{
		$$ = &ast.IndexLockAndAlgorithm{
			LockTp:      $1.(ast.LockType),
			AlgorithmTp: ast.AlgorithmTypeDefault,
		}
	}
|	AlgorithmClause
	{
		$$ = &ast.IndexLockAndAlgorithm{
			LockTp:      ast.LockTypeDefault,
			AlgorithmTp: $1.(ast.AlgorithmType),
		}
	}
|	LockClause AlgorithmClause
	{
		$$ = &ast.IndexLockAndAlgorithm{
			LockTp:      $1.(ast.LockType),
			AlgorithmTp: $2.(ast.AlgorithmType),
		}
	}
|	AlgorithmClause LockClause
	{
		$$ = &ast.IndexLockAndAlgorithm{
			LockTp:      $2.(ast.LockType),
			AlgorithmTp: $1.(ast.AlgorithmType),
		}
	}

IndexKeyTypeOpt:
	{
		$$ = ast.IndexKeyTypeNone
	}
|	"UNIQUE"
	{
		$$ = ast.IndexKeyTypeUnique
	}
|	"SPATIAL"
	{
		$$ = ast.IndexKeyTypeSpatial
	}
|	"FULLTEXT"
	{
		$$ = ast.IndexKeyTypeFullText
	}

/**************************************AlterDatabaseStmt***************************************
 * See https://dev.mysql.com/doc/refman/5.7/en/alter-database.html
 * 'ALTER DATABASE ... UPGRADE DATA DIRECTORY NAME' is not supported yet.
 *
 *  ALTER {DATABASE | SCHEMA} [db_name]
 *   alter_specification ...
 *
 *  alter_specification:
 *   [DEFAULT] CHARACTER SET [=] charset_name
 * | [DEFAULT] COLLATE [=] collation_name
 * | [DEFAULT] ENCRYPTION [=] {'Y' | 'N'}
 *******************************************************************************************/
AlterDatabaseStmt:
	"ALTER" DatabaseSym DBName DatabaseOptionList
	{
		$$ = &ast.AlterDatabaseStmt{
			Name:                 $3,
			AlterDefaultDatabase: false,
			Options:              $4.([]*ast.DatabaseOption),
		}
	}
|	"ALTER" DatabaseSym DatabaseOptionList
	{
		$$ = &ast.AlterDatabaseStmt{
			Name:                 "",
			AlterDefaultDatabase: true,
			Options:              $3.([]*ast.DatabaseOption),
		}
	}

/*******************************************************************
 *
 *  Create Database Statement
 *  CREATE {DATABASE | SCHEMA} [IF NOT EXISTS] db_name
 *      [create_specification] ...
 *
 *  create_specification:
 *      [DEFAULT] CHARACTER SET [=] charset_name
 *    | [DEFAULT] COLLATE [=] collation_name
 *    | [DEFAULT] ENCRYPTION [=] {'Y' | 'N'}
 *******************************************************************/
CreateDatabaseStmt:
	"CREATE" DatabaseSym IfNotExists DBName DatabaseOptionListOpt
	{
		$$ = &ast.CreateDatabaseStmt{
			IfNotExists: $3.(bool),
			Name:        $4,
			Options:     $5.([]*ast.DatabaseOption),
		}
	}

DBName:
	Identifier

DatabaseOption:
	DefaultKwdOpt CharsetKw EqOpt CharsetName
	{
		$$ = &ast.DatabaseOption{Tp: ast.DatabaseOptionCharset, Value: $4}
	}
|	DefaultKwdOpt "COLLATE" EqOpt CollationName
	{
		$$ = &ast.DatabaseOption{Tp: ast.DatabaseOptionCollate, Value: $4}
	}
|	DefaultKwdOpt "ENCRYPTION" EqOpt EncryptionOpt
	{
		$$ = &ast.DatabaseOption{Tp: ast.DatabaseOptionEncryption, Value: $4}
	}

DatabaseOptionListOpt:
	{
		$$ = []*ast.DatabaseOption{}
	}
|	DatabaseOptionList

DatabaseOptionList:
	DatabaseOption
	{
		$$ = []*ast.DatabaseOption{$1.(*ast.DatabaseOption)}
	}
|	DatabaseOptionList DatabaseOption
	{
		$$ = append($1.([]*ast.DatabaseOption), $2.(*ast.DatabaseOption))
	}

/*******************************************************************
 *
 *  Create Table Statement
 *
 *  Example:
 *      CREATE TABLE Persons
 *      (
 *          P_Id int NOT NULL,
 *          LastName varchar(255) NOT NULL,
 *          FirstName varchar(255),
 *          Address varchar(255),
 *          City varchar(255),
 *          PRIMARY KEY (P_Id)
 *      )
 *******************************************************************/
CreateTableStmt:
	"CREATE" OptTemporary "TABLE" IfNotExists TableName TableElementListOpt CreateTableOptionListOpt PartitionOpt DuplicateOpt AsOpt CreateTableSelectOpt
	{
		stmt := $6.(*ast.CreateTableStmt)
		stmt.Table = $5.(*ast.TableName)
		stmt.IfNotExists = $4.(bool)
		stmt.IsTemporary = $2.(bool)
		stmt.Options = $7.([]*ast.TableOption)
		if $8 != nil {
			stmt.Partition = $8.(*ast.PartitionOptions)
		}
		stmt.OnDuplicate = $9.(ast.OnDuplicateKeyHandlingType)
		stmt.Select = $11.(*ast.CreateTableStmt).Select
		$$ = stmt
	}
|	"CREATE" OptTemporary "TABLE" IfNotExists TableName LikeTableWithOrWithoutParen
	{
		$$ = &ast.CreateTableStmt{
			Table:       $5.(*ast.TableName),
			ReferTable:  $6.(*ast.TableName),
			IfNotExists: $4.(bool),
			IsTemporary: $2.(bool),
		}
	}
|	"CREATE" OptTemporary "TAG" IfNotExists TableName TableElementListOpt CreateTableOptionListOpt PartitionOpt DuplicateOpt AsOpt CreateTableSelectOpt
	{
		stmt := $6.(*ast.CreateTableStmt)
		stmt.Type = model.TableTypeIsGraphTag
		stmt.Table = $5.(*ast.TableName)
		stmt.IfNotExists = $4.(bool)
		stmt.IsTemporary = $2.(bool)
		stmt.Options = $7.([]*ast.TableOption)
		if $8 != nil {
			stmt.Partition = $8.(*ast.PartitionOptions)
		}
		stmt.OnDuplicate = $9.(ast.OnDuplicateKeyHandlingType)
		stmt.Select = $11.(*ast.CreateTableStmt).Select
		$$ = stmt
	}
|	"CREATE" OptTemporary "EDGE" IfNotExists TableName TableElementListOpt CreateTableOptionListOpt PartitionOpt DuplicateOpt AsOpt CreateTableSelectOpt
	{
		stmt := $6.(*ast.CreateTableStmt)
		stmt.Type = model.TableTypeIsGraphEdge
		stmt.Table = $5.(*ast.TableName)
		stmt.IfNotExists = $4.(bool)
		stmt.IsTemporary = $2.(bool)
		stmt.Options = $7.([]*ast.TableOption)
		if $8 != nil {
			stmt.Partition = $8.(*ast.PartitionOptions)
		}
		stmt.OnDuplicate = $9.(ast.OnDuplicateKeyHandlingType)
		stmt.Select = $11.(*ast.CreateTableStmt).Select
		$$ = stmt
	}

DefaultKwdOpt:
	%prec lowerThanCharsetKwd
	{}
|	"DEFAULT"

PartitionOpt:
	{
		$$ = nil
	}
|	"PARTITION" "BY" PartitionMethod PartitionNumOpt SubPartitionOpt PartitionDefinitionListOpt
	{
		method := $3.(*ast.PartitionMethod)
		method.Num = $4.(uint64)
		sub, _ := $5.(*ast.PartitionMethod)
		defs, _ := $6.([]*ast.PartitionDefinition)
		opt := &ast.PartitionOptions{
			PartitionMethod: *method,
			Sub:             sub,
			Definitions:     defs,
		}
		if err := opt.Validate(); err != nil {
			yylex.AppendError(err)
			return 1
		}
		$$ = opt
	}

SubPartitionMethod:
	LinearOpt "KEY" PartitionKeyAlgorithmOpt '(' ColumnNameListOpt ')'
	{
		$$ = &ast.PartitionMethod{
			Tp:          model.PartitionTypeKey,
			Linear:      len($1) != 0,
			ColumnNames: $5.([]*ast.ColumnName),
		}
	}
|	LinearOpt "HASH" '(' BitExpr ')'
	{
		$$ = &ast.PartitionMethod{
			Tp:     model.PartitionTypeHash,
			Linear: len($1) != 0,
			Expr:   $4.(ast.ExprNode),
		}
	}

PartitionKeyAlgorithmOpt:
	/* empty */
	{}
|	"ALGORITHM" '=' NUM
	{}

PartitionMethod:
	SubPartitionMethod
|	"RANGE" '(' BitExpr ')'
	{
		$$ = &ast.PartitionMethod{
			Tp:   model.PartitionTypeRange,
			Expr: $3.(ast.ExprNode),
		}
	}
|	"RANGE" FieldsOrColumns '(' ColumnNameList ')'
	{
		$$ = &ast.PartitionMethod{
			Tp:          model.PartitionTypeRange,
			ColumnNames: $4.([]*ast.ColumnName),
		}
	}
|	"LIST" '(' BitExpr ')'
	{
		$$ = &ast.PartitionMethod{
			Tp:   model.PartitionTypeList,
			Expr: $3.(ast.ExprNode),
		}
	}
|	"LIST" FieldsOrColumns '(' ColumnNameList ')'
	{
		$$ = &ast.PartitionMethod{
			Tp:          model.PartitionTypeList,
			ColumnNames: $4.([]*ast.ColumnName),
		}
	}
|	"SYSTEM_TIME" "INTERVAL" Expression TimeUnit
	{
		$$ = &ast.PartitionMethod{
			Tp:   model.PartitionTypeSystemTime,
			Expr: $3.(ast.ExprNode),
			Unit: $4.(ast.TimeUnitType),
		}
	}
|	"SYSTEM_TIME" "LIMIT" LengthNum
	{
		$$ = &ast.PartitionMethod{
			Tp:    model.PartitionTypeSystemTime,
			Limit: $3.(uint64),
		}
	}
|	"SYSTEM_TIME"
	{
		$$ = &ast.PartitionMethod{
			Tp: model.PartitionTypeSystemTime,
		}
	}

LinearOpt:
	{
		$$ = ""
	}
|	"LINEAR"

SubPartitionOpt:
	{
		$$ = nil
	}
|	"SUBPARTITION" "BY" SubPartitionMethod SubPartitionNumOpt
	{
		method := $3.(*ast.PartitionMethod)
		method.Num = $4.(uint64)
		$$ = method
	}

SubPartitionNumOpt:
	{
		$$ = uint64(0)
	}
|	"SUBPARTITIONS" LengthNum
	{
		res := $2.(uint64)
		if res == 0 {
			yylex.AppendError(ast.ErrNoParts.GenWithStackByArgs("subpartitions"))
			return 1
		}
		$$ = res
	}

PartitionNumOpt:
	{
		$$ = uint64(0)
	}
|	"PARTITIONS" LengthNum
	{
		res := $2.(uint64)
		if res == 0 {
			yylex.AppendError(ast.ErrNoParts.GenWithStackByArgs("partitions"))
			return 1
		}
		$$ = res
	}

PartitionDefinitionListOpt:
	/* empty */ %prec lowerThanCreateTableSelect
	{
		$$ = nil
	}
|	'(' PartitionDefinitionList ')'
	{
		$$ = $2.([]*ast.PartitionDefinition)
	}

PartitionDefinitionList:
	PartitionDefinition
	{
		$$ = []*ast.PartitionDefinition{$1.(*ast.PartitionDefinition)}
	}
|	PartitionDefinitionList ',' PartitionDefinition
	{
		$$ = append($1.([]*ast.PartitionDefinition), $3.(*ast.PartitionDefinition))
	}

PartitionDefinition:
	"PARTITION" Identifier PartDefValuesOpt PartDefOptionList SubPartDefinitionListOpt
	{
		$$ = &ast.PartitionDefinition{
			Name:    model.NewCIStr($2),
			Clause:  $3.(ast.PartitionDefinitionClause),
			Options: $4.([]*ast.TableOption),
			Sub:     $5.([]*ast.SubPartitionDefinition),
		}
	}

SubPartDefinitionListOpt:
	/*empty*/
	{
		$$ = make([]*ast.SubPartitionDefinition, 0)
	}
|	'(' SubPartDefinitionList ')'
	{
		$$ = $2
	}

SubPartDefinitionList:
	SubPartDefinition
	{
		$$ = []*ast.SubPartitionDefinition{$1.(*ast.SubPartitionDefinition)}
	}
|	SubPartDefinitionList ',' SubPartDefinition
	{
		list := $1.([]*ast.SubPartitionDefinition)
		$$ = append(list, $3.(*ast.SubPartitionDefinition))
	}

SubPartDefinition:
	"SUBPARTITION" Identifier PartDefOptionList
	{
		$$ = &ast.SubPartitionDefinition{
			Name:    model.NewCIStr($2),
			Options: $3.([]*ast.TableOption),
		}
	}

PartDefOptionList:
	/*empty*/
	{
		$$ = make([]*ast.TableOption, 0)
	}
|	PartDefOptionList PartDefOption
	{
		list := $1.([]*ast.TableOption)
		$$ = append(list, $2.(*ast.TableOption))
	}

PartDefOption:
	"COMMENT" EqOpt stringLit
	{
		$$ = &ast.TableOption{Tp: ast.TableOptionComment, StrValue: $3}
	}
|	"ENGINE" EqOpt StringName
	{
		$$ = &ast.TableOption{Tp: ast.TableOptionEngine, StrValue: $3}
	}
|	"STORAGE" "ENGINE" EqOpt StringName
	{
		$$ = &ast.TableOption{Tp: ast.TableOptionEngine, StrValue: $4}
	}
|	"INSERT_METHOD" EqOpt StringName
	{
		$$ = &ast.TableOption{Tp: ast.TableOptionInsertMethod, StrValue: $3}
	}
|	"DATA" "DIRECTORY" EqOpt stringLit
	{
		$$ = &ast.TableOption{Tp: ast.TableOptionDataDirectory, StrValue: $4}
	}
|	"INDEX" "DIRECTORY" EqOpt stringLit
	{
		$$ = &ast.TableOption{Tp: ast.TableOptionIndexDirectory, StrValue: $4}
	}
|	"MAX_ROWS" EqOpt LengthNum
	{
		$$ = &ast.TableOption{Tp: ast.TableOptionMaxRows, UintValue: $3.(uint64)}
	}
|	"MIN_ROWS" EqOpt LengthNum
	{
		$$ = &ast.TableOption{Tp: ast.TableOptionMinRows, UintValue: $3.(uint64)}
	}
|	"TABLESPACE" EqOpt Identifier
	{
		$$ = &ast.TableOption{Tp: ast.TableOptionTablespace, StrValue: $3}
	}
|	"NODEGROUP" EqOpt LengthNum
	{
		$$ = &ast.TableOption{Tp: ast.TableOptionNodegroup, UintValue: $3.(uint64)}
	}

PartDefValuesOpt:
	{
		$$ = &ast.PartitionDefinitionClauseNone{}
	}
|	"VALUES" "LESS" "THAN" "MAXVALUE"
	{
		$$ = &ast.PartitionDefinitionClauseLessThan{
			Exprs: []ast.ExprNode{&ast.MaxValueExpr{}},
		}
	}
|	"VALUES" "LESS" "THAN" '(' MaxValueOrExpressionList ')'
	{
		$$ = &ast.PartitionDefinitionClauseLessThan{
			Exprs: $5.([]ast.ExprNode),
		}
	}
|	"DEFAULT"
	{
		$$ = &ast.PartitionDefinitionClauseIn{}
	}
|	"VALUES" "IN" '(' MaxValueOrExpressionList ')'
	{
		exprs := $4.([]ast.ExprNode)
		values := make([][]ast.ExprNode, 0, len(exprs))
		for _, expr := range exprs {
			if row, ok := expr.(*ast.RowExpr); ok {
				values = append(values, row.Values)
			} else {
				values = append(values, []ast.ExprNode{expr})
			}
		}
		$$ = &ast.PartitionDefinitionClauseIn{Values: values}
	}
|	"HISTORY"
	{
		$$ = &ast.PartitionDefinitionClauseHistory{Current: false}
	}
|	"CURRENT"
	{
		$$ = &ast.PartitionDefinitionClauseHistory{Current: true}
	}

DuplicateOpt:
	{
		$$ = ast.OnDuplicateKeyHandlingError
	}
|	"IGNORE"
	{
		$$ = ast.OnDuplicateKeyHandlingIgnore
	}
|	"REPLACE"
	{
		$$ = ast.OnDuplicateKeyHandlingReplace
	}

AsOpt:
	{}
|	"AS"
	{}

CreateTableSelectOpt:
	/* empty */
	{
		$$ = &ast.CreateTableStmt{}
	}
|	SetOprStmt1
	{
		$$ = &ast.CreateTableStmt{Select: $1}
	}

CreateViewSelectOpt:
	SetOprStmt1
|	'(' SetOprStmt1 ')'
	{
		$$ = $2
	}

LikeTableWithOrWithoutParen:
	"LIKE" TableName
	{
		$$ = $2
	}
|	'(' "LIKE" TableName ')'
	{
		$$ = $3
	}

/*******************************************************************
 *
 *  Create View Statement
 *
 *  Example:
 *      CREATE VIEW OR REPLACE ALGORITHM = MERGE DEFINER="root@localhost" SQL SECURITY = definer view_name (col1,col2)
 *          as select Col1,Col2 from table WITH LOCAL CHECK OPTION
 *******************************************************************/
CreateViewStmt:
	"CREATE" OrReplace ViewAlgorithm ViewDefiner ViewSQLSecurity "VIEW" ViewName ViewFieldList "AS" CreateViewSelectOpt ViewCheckOption
	{
		startOffset := parser.startOffset(&yyS[yypt-1])
		selStmt := $10.(ast.StmtNode)
		selStmt.SetText(strings.TrimSpace(parser.src[startOffset:]))
		x := &ast.CreateViewStmt{
			OrReplace: $2.(bool),
			ViewName:  $7.(*ast.TableName),
			Select:    selStmt,
			Algorithm: $3.(model.ViewAlgorithm),
			Definer:   $4.(*auth.UserIdentity),
			Security:  $5.(model.ViewSecurity),
		}
		if $8 != nil {
			x.Cols = $8.([]model.CIStr)
		}
		if $11 != nil {
			x.CheckOption = $11.(model.ViewCheckOption)
			endOffset := parser.startOffset(&yyS[yypt])
			selStmt.SetText(strings.TrimSpace(parser.src[startOffset:endOffset]))
		} else {
			x.CheckOption = model.CheckOptionCascaded
		}
		$$ = x
	}

OrReplace:
	/* EMPTY */
	{
		$$ = false
	}
|	"OR" "REPLACE"
	{
		$$ = true
	}

ViewAlgorithm:
	/* EMPTY */
	{
		$$ = model.AlgorithmUndefined
	}
|	"ALGORITHM" "=" "UNDEFINED"
	{
		$$ = model.AlgorithmUndefined
	}
|	"ALGORITHM" "=" "MERGE"
	{
		$$ = model.AlgorithmMerge
	}
|	"ALGORITHM" "=" "TEMPTABLE"
	{
		$$ = model.AlgorithmTemptable
	}

ViewDefiner:
	/* EMPTY */
	{
		$$ = &auth.UserIdentity{CurrentUser: true}
	}
|	"DEFINER" "=" Username
	{
		$$ = $3
	}

ViewSQLSecurity:
	/* EMPTY */
	{
		$$ = model.SecurityDefiner
	}
|	"SQL" "SECURITY" "DEFINER"
	{
		$$ = model.SecurityDefiner
	}
|	"SQL" "SECURITY" "INVOKER"
	{
		$$ = model.SecurityInvoker
	}

ViewName:
	TableName

ViewFieldList:
	/* Empty */
	{
		$$ = nil
	}
|	'(' ColumnList ')'
	{
		$$ = $2.([]model.CIStr)
	}

ColumnList:
	Identifier
	{
		$$ = []model.CIStr{model.NewCIStr($1)}
	}
|	ColumnList ',' Identifier
	{
		$$ = append($1.([]model.CIStr), model.NewCIStr($3))
	}

ViewCheckOption:
	/* EMPTY */
	{
		$$ = nil
	}
|	"WITH" "CASCADED" "CHECK" "OPTION"
	{
		$$ = model.CheckOptionCascaded
	}
|	"WITH" "LOCAL" "CHECK" "OPTION"
	{
		$$ = model.CheckOptionLocal
	}

/******************************************************************
 * Do statement
 * See https://dev.mysql.com/doc/refman/5.7/en/do.html
 ******************************************************************/
DoStmt:
	"DO" ExpressionList
	{
		$$ = &ast.DoStmt{
			Exprs: $2.([]ast.ExprNode),
		}
	}

/*******************************************************************
 *
 *  Delete Statement
 *
 *******************************************************************/
DeleteWithoutUsingStmt:
	"DELETE" TableOptimizerHintsOpt PriorityOpt QuickOptional IgnoreOptional "FROM" TableName PartitionNameListOpt TableAsNameOpt IndexHintListOpt WhereClauseOptional OrderByOptional LimitClause
	{
		// Single Table
		tn := $7.(*ast.TableName)
		tn.IndexHints = $10.([]*ast.IndexHint)
		tn.PartitionNames = $8.([]model.CIStr)
		join := &ast.Join{Left: &ast.TableSource{Source: tn, AsName: $9.(model.CIStr)}, Right: nil}
		x := &ast.DeleteStmt{
			TableRefs: &ast.TableRefsClause{TableRefs: join},
			Priority:  $3.(mysql.PriorityEnum),
			Quick:     $4.(bool),
			IgnoreErr: $5.(bool),
		}
		if $2 != nil {
			x.TableHints = $2.([]*ast.TableOptimizerHint)
		}
		if $11 != nil {
			x.Where = $11.(ast.ExprNode)
		}
		if $12 != nil {
			x.Order = $12.(*ast.OrderByClause)
		}
		if $13 != nil {
			x.Limit = $13.(*ast.Limit)
		}

		$$ = x
	}
|	"DELETE" TableOptimizerHintsOpt PriorityOpt QuickOptional IgnoreOptional TableAliasRefList "FROM" TableRefs WhereClauseOptional
	{
		// Multiple Table
		x := &ast.DeleteStmt{
			Priority:     $3.(mysql.PriorityEnum),
			Quick:        $4.(bool),
			IgnoreErr:    $5.(bool),
			IsMultiTable: true,
			BeforeFrom:   true,
			Tables:       &ast.DeleteTableList{Tables: $6.([]*ast.TableName)},
			TableRefs:    &ast.TableRefsClause{TableRefs: $8.(*ast.Join)},
		}
		if $2 != nil {
			x.TableHints = $2.([]*ast.TableOptimizerHint)
		}
		if $9 != nil {
			x.Where = $9.(ast.ExprNode)
		}
		$$ = x
	}

DeleteWithUsingStmt:
	"DELETE" TableOptimizerHintsOpt PriorityOpt QuickOptional IgnoreOptional "FROM" TableAliasRefList "USING" TableRefs WhereClauseOptional
	{
		// Multiple Table
		x := &ast.DeleteStmt{
			Priority:     $3.(mysql.PriorityEnum),
			Quick:        $4.(bool),
			IgnoreErr:    $5.(bool),
			IsMultiTable: true,
			Tables:       &ast.DeleteTableList{Tables: $7.([]*ast.TableName)},
			TableRefs:    &ast.TableRefsClause{TableRefs: $9.(*ast.Join)},
		}
		if $2 != nil {
			x.TableHints = $2.([]*ast.TableOptimizerHint)
		}
		if $10 != nil {
			x.Where = $10.(ast.ExprNode)
		}
		$$ = x
	}

DeleteFromStmt:
	DeleteWithoutUsingStmt
|	DeleteWithUsingStmt

DatabaseSym:
	"DATABASE"

DropDatabaseStmt:
	"DROP" DatabaseSym IfExists DBName
	{
		$$ = &ast.DropDatabaseStmt{IfExists: $3.(bool), Name: $4}
	}

/******************************************************************
 * Drop Index Statement
 * See https://dev.mysql.com/doc/refman/8.0/en/drop-index.html
 *
 *  DROP INDEX index_name ON tbl_name
 *      [algorithm_option | lock_option] ...
 *
 *  algorithm_option:
 *      ALGORITHM [=] {DEFAULT|INPLACE|COPY}
 *
 *  lock_option:
 *      LOCK [=] {DEFAULT|NONE|SHARED|EXCLUSIVE}
 ******************************************************************/
DropIndexStmt:
	"DROP" "INDEX" IfExists Identifier "ON" TableName IndexLockAndAlgorithmOpt
	{
		var indexLockAndAlgorithm *ast.IndexLockAndAlgorithm
		if $7 != nil {
			indexLockAndAlgorithm = $7.(*ast.IndexLockAndAlgorithm)
			if indexLockAndAlgorithm.LockTp == ast.LockTypeDefault && indexLockAndAlgorithm.AlgorithmTp == ast.AlgorithmTypeDefault {
				indexLockAndAlgorithm = nil
			}
		}
		$$ = &ast.DropIndexStmt{IfExists: $3.(bool), IndexName: $4, Table: $6.(*ast.TableName), LockAlg: indexLockAndAlgorithm}
	}

DropTableStmt:
	"DROP" OptTemporary TableOrTables IfExists TableNameList RestrictOrCascadeOpt
	{
		$$ = &ast.DropTableStmt{IfExists: $4.(bool), Tables: $5.([]*ast.TableName), IsView: false, IsTemporary: $2.(bool)}
	}

OptTemporary:
	/* empty */
	{
		$$ = false
	}
|	"TEMPORARY"
	{
		$$ = true
		yylex.AppendError(yylex.Errorf("TiDB doesn't support TEMPORARY TABLE, TEMPORARY will be parsed but ignored."))
		parser.lastErrorAsWarn()
	}

DropViewStmt:
	"DROP" "VIEW" TableNameList RestrictOrCascadeOpt
	{
		$$ = &ast.DropTableStmt{Tables: $3.([]*ast.TableName), IsView: true}
	}
|	"DROP" "VIEW" "IF" "EXISTS" TableNameList RestrictOrCascadeOpt
	{
		$$ = &ast.DropTableStmt{IfExists: true, Tables: $5.([]*ast.TableName), IsView: true}
	}

DropUserStmt:
	"DROP" "USER" UsernameList
	{
		$$ = &ast.DropUserStmt{IsDropRole: false, IfExists: false, UserList: $3.([]*auth.UserIdentity)}
	}
|	"DROP" "USER" "IF" "EXISTS" UsernameList
	{
		$$ = &ast.DropUserStmt{IsDropRole: false, IfExists: true, UserList: $5.([]*auth.UserIdentity)}
	}

DropRoleStmt:
	"DROP" "ROLE" RolenameList
	{
		tmp := make([]*auth.UserIdentity, 0, 10)
		roleList := $3.([]*auth.RoleIdentity)
		for _, r := range roleList {
			tmp = append(tmp, &auth.UserIdentity{Username: r.Username, Hostname: r.Hostname})
		}
		$$ = &ast.DropUserStmt{IsDropRole: true, IfExists: false, UserList: tmp}
	}
|	"DROP" "ROLE" "IF" "EXISTS" RolenameList
	{
		tmp := make([]*auth.UserIdentity, 0, 10)
		roleList := $5.([]*auth.RoleIdentity)
		for _, r := range roleList {
			tmp = append(tmp, &auth.UserIdentity{Username: r.Username, Hostname: r.Hostname})
		}
		$$ = &ast.DropUserStmt{IsDropRole: true, IfExists: true, UserList: tmp}
	}

DropStatsStmt:
	"DROP" "STATS" TableName
	{
		$$ = &ast.DropStatsStmt{Table: $3.(*ast.TableName)}
	}

RestrictOrCascadeOpt:
	{}
|	"RESTRICT"
|	"CASCADE"

TableOrTables:
	"TABLE"
|	"TABLES"

EqOpt:
	{}
|	eq

EmptyStmt:
	/* EMPTY */
	{
		$$ = nil
	}

TraceStmt:
	"TRACE" TraceableStmt
	{
		$$ = &ast.TraceStmt{
			Stmt:   $2,
			Format: "row",
		}
		startOffset := parser.startOffset(&yyS[yypt])
		$2.SetText(string(parser.src[startOffset:]))
	}
|	"TRACE" "FORMAT" "=" stringLit TraceableStmt
	{
		$$ = &ast.TraceStmt{
			Stmt:   $5,
			Format: $4,
		}
		startOffset := parser.startOffset(&yyS[yypt])
		$5.SetText(string(parser.src[startOffset:]))
	}

ExplainSym:
	"EXPLAIN"
|	"DESCRIBE"
|	"DESC"

ExplainStmt:
	ExplainSym TableName
	{
		$$ = &ast.ExplainStmt{
			Stmt: &ast.ShowStmt{
				Tp:    ast.ShowColumns,
				Table: $2.(*ast.TableName),
			},
		}
	}
|	ExplainSym TableName ColumnName
	{
		$$ = &ast.ExplainStmt{
			Stmt: &ast.ShowStmt{
				Tp:     ast.ShowColumns,
				Table:  $2.(*ast.TableName),
				Column: $3.(*ast.ColumnName),
			},
		}
	}
|	ExplainSym ExplainableStmt
	{
		$$ = &ast.ExplainStmt{
			Stmt:   $2,
			Format: "row",
		}
	}
|	ExplainSym "FOR" "CONNECTION" NUM
	{
		$$ = &ast.ExplainForStmt{
			Format:       "row",
			ConnectionID: getUint64FromNUM($4),
		}
	}
|	ExplainSym "FORMAT" "=" stringLit "FOR" "CONNECTION" NUM
	{
		$$ = &ast.ExplainForStmt{
			Format:       $4,
			ConnectionID: getUint64FromNUM($7),
		}
	}
|	ExplainSym "FORMAT" "=" stringLit ExplainableStmt
	{
		$$ = &ast.ExplainStmt{
			Stmt:   $5,
			Format: $4,
		}
	}
|	ExplainSym "FORMAT" "=" ExplainFormatType "FOR" "CONNECTION" NUM
	{
		$$ = &ast.ExplainForStmt{
			Format:       $4,
			ConnectionID: getUint64FromNUM($7),
		}
	}
|	ExplainSym "FORMAT" "=" ExplainFormatType ExplainableStmt
	{
		$$ = &ast.ExplainStmt{
			Stmt:   $5,
			Format: $4,
		}
	}
|	ExplainSym "ANALYZE" ExplainableStmt
	{
		$$ = &ast.ExplainStmt{
			Stmt:    $3,
			Format:  "row",
			Analyze: true,
		}
	}

ExplainFormatType:
	"TRADITIONAL"
	{
		$$ = "row"
	}
|	"JSON"
	{
		$$ = "json"
	}

/*******************************************************************
 * Backup / restore / import statements
 *
 *	BACKUP DATABASE [ * | db1, db2, db3 ] TO 'scheme://location' [ options... ]
 *	BACKUP TABLE [ db1.tbl1, db2.tbl2 ] TO 'scheme://location' [ options... ]
 *	RESTORE DATABASE [ * | db1, db2, db3 ] FROM 'scheme://location' [ options... ]
 *	RESTORE TABLE [ db1.tbl1, db2.tbl2 ] FROM 'scheme://location' [ options... ]
 *	IMPORT DATABASE [ * | db1, db2, db3 ] FROM 'scheme://location' [ options... ]
 *	IMPORT TABLE [ db1.tbl1, db2.tbl2 ] FROM 'scheme://location' [ options... ]
 */
BRIEStmt:
	"BACKUP" BRIETables "TO" stringLit BRIEOptions
	{
		stmt := $2.(*ast.BRIEStmt)
		stmt.Kind = ast.BRIEKindBackup
		stmt.Storage = $4
		stmt.Options = $5.([]*ast.BRIEOption)
		$$ = stmt
	}
|	"RESTORE" BRIETables "FROM" stringLit BRIEOptions
	{
		stmt := $2.(*ast.BRIEStmt)
		stmt.Kind = ast.BRIEKindRestore
		stmt.Storage = $4
		stmt.Options = $5.([]*ast.BRIEOption)
		$$ = stmt
	}
|	"IMPORT" BRIETables "FROM" stringLit BRIEOptions
	{
		stmt := $2.(*ast.BRIEStmt)
		stmt.Kind = ast.BRIEKindImport
		stmt.Storage = $4
		stmt.Options = $5.([]*ast.BRIEOption)
		$$ = stmt
	}

BRIETables:
	DatabaseSym '*'
	{
		$$ = &ast.BRIEStmt{}
	}
|	DatabaseSym DBNameList
	{
		$$ = &ast.BRIEStmt{Schemas: $2.([]string)}
	}
|	"TABLE" TableNameList
	{
		$$ = &ast.BRIEStmt{Tables: $2.([]*ast.TableName)}
	}

DBNameList:
	DBName
	{
		$$ = []string{$1}
	}
|	DBNameList ',' DBName
	{
		$$ = append($1.([]string), $3)
	}

BRIEOptions:
	%prec empty
	{
		$$ = []*ast.BRIEOption{}
	}
|	BRIEOptions BRIEOption
	{
		$$ = append($1.([]*ast.BRIEOption), $2.(*ast.BRIEOption))
	}

BRIEIntegerOptionName:
	"CONCURRENCY"
	{
		$$ = ast.BRIEOptionConcurrency
	}
|	"RESUME"
	{
		$$ = ast.BRIEOptionResume
	}

BRIEBooleanOptionName:
	"SEND_CREDENTIALS_TO_TIKV"
	{
		$$ = ast.BRIEOptionSendCreds
	}
|	"ONLINE"
	{
		$$ = ast.BRIEOptionOnline
	}
|	"CHECKPOINT"
	{
		$$ = ast.BRIEOptionCheckpoint
	}
|	"SKIP_SCHEMA_FILES"
	{
		$$ = ast.BRIEOptionSkipSchemaFiles
	}
|	"STRICT_FORMAT"
	{
		$$ = ast.BRIEOptionStrictFormat
	}
|	"CSV_NOT_NULL"
	{
		$$ = ast.BRIEOptionCSVNotNull
	}
|	"CSV_BACKSLASH_ESCAPE"
	{
		$$ = ast.BRIEOptionCSVBackslashEscape
	}
|	"CSV_TRIM_LAST_SEPARATORS"
	{
		$$ = ast.BRIEOptionCSVTrimLastSeparators
	}

BRIEStringOptionName:
	"TIKV_IMPORTER"
	{
		$$ = ast.BRIEOptionTiKVImporter
	}
|	"CSV_SEPARATOR"
	{
		$$ = ast.BRIEOptionCSVSeparator
	}
|	"CSV_DELIMITER"
	{
		$$ = ast.BRIEOptionCSVDelimiter
	}
|	"CSV_NULL"
	{
		$$ = ast.BRIEOptionCSVNull
	}

BRIEKeywordOptionName:
	"BACKEND"
	{
		$$ = ast.BRIEOptionBackend
	}
|	"ON_DUPLICATE"
	{
		$$ = ast.BRIEOptionOnDuplicate
	}
|	"ON" "DUPLICATE"
	{
		$$ = ast.BRIEOptionOnDuplicate
	}

BRIEOption:
	BRIEIntegerOptionName EqOpt LengthNum
	{
		$$ = &ast.BRIEOption{
			Tp:        $1.(ast.BRIEOptionType),
			UintValue: $3.(uint64),
		}
	}
|	BRIEBooleanOptionName EqOpt Boolean
	{
		value := uint64(0)
		if $3.(bool) {
			value = 1
		}
		$$ = &ast.BRIEOption{
			Tp:        $1.(ast.BRIEOptionType),
			UintValue: value,
		}
	}
|	BRIEStringOptionName EqOpt stringLit
	{
		$$ = &ast.BRIEOption{
			Tp:       $1.(ast.BRIEOptionType),
			StrValue: $3,
		}
	}
|	BRIEKeywordOptionName EqOpt StringNameOrBRIEOptionKeyword
	{
		$$ = &ast.BRIEOption{
			Tp:       $1.(ast.BRIEOptionType),
			StrValue: strings.ToLower($3),
		}
	}
|	"SNAPSHOT" EqOpt LengthNum TimestampUnit "AGO"
	{
		unit, err := $4.(ast.TimeUnitType).Duration()
		if err != nil {
			yylex.AppendError(err)
			return 1
		}
		// TODO: check overflow?
		$$ = &ast.BRIEOption{
			Tp:        ast.BRIEOptionBackupTimeAgo,
			UintValue: $3.(uint64) * uint64(unit),
		}
	}
|	"SNAPSHOT" EqOpt stringLit
	// not including this into BRIEStringOptionName to avoid shift/reduce conflict
	{
		$$ = &ast.BRIEOption{
			Tp:       ast.BRIEOptionBackupTS,
			StrValue: $3,
		}
	}
|	"SNAPSHOT" EqOpt LengthNum
	// not including this into BRIEIntegerOptionName to avoid shift/reduce conflict
	{
		$$ = &ast.BRIEOption{
			Tp:        ast.BRIEOptionBackupTSO,
			UintValue: $3.(uint64),
		}
	}
|	"LAST_BACKUP" EqOpt stringLit
	{
		$$ = &ast.BRIEOption{
			Tp:       ast.BRIEOptionLastBackupTS,
			StrValue: $3,
		}
	}
|	"LAST_BACKUP" EqOpt LengthNum
	{
		$$ = &ast.BRIEOption{
			Tp:        ast.BRIEOptionLastBackupTSO,
			UintValue: $3.(uint64),
		}
	}
|	"RATE_LIMIT" EqOpt LengthNum "MB" '/' "SECOND"
	{
		// TODO: check overflow?
		$$ = &ast.BRIEOption{
			Tp:        ast.BRIEOptionRateLimit,
			UintValue: $3.(uint64) * 1048576,
		}
	}
|	"CSV_HEADER" EqOpt FieldsOrColumns
	{
		$$ = &ast.BRIEOption{
			Tp:        ast.BRIEOptionCSVHeader,
			UintValue: ast.BRIECSVHeaderIsColumns,
		}
	}
|	"CSV_HEADER" EqOpt LengthNum
	{
		$$ = &ast.BRIEOption{
			Tp:        ast.BRIEOptionCSVHeader,
			UintValue: $3.(uint64),
		}
	}
|	"CHECKSUM" EqOpt Boolean
	{
		value := uint64(0)
		if $3.(bool) {
			value = 1
		}
		$$ = &ast.BRIEOption{
			Tp:        ast.BRIEOptionChecksum,
			UintValue: value,
		}
	}
|	"CHECKSUM" EqOpt OptionLevel
	{
		$$ = &ast.BRIEOption{
			Tp:        ast.BRIEOptionChecksum,
			UintValue: uint64($3.(ast.BRIEOptionLevel)),
		}
	}
|	"ANALYZE" EqOpt Boolean
	{
		value := uint64(0)
		if $3.(bool) {
			value = 1
		}
		$$ = &ast.BRIEOption{
			Tp:        ast.BRIEOptionAnalyze,
			UintValue: value,
		}
	}
|	"ANALYZE" EqOpt OptionLevel
	{
		$$ = &ast.BRIEOption{
			Tp:        ast.BRIEOptionAnalyze,
			UintValue: uint64($3.(ast.BRIEOptionLevel)),
		}
	}

LengthNum:
	NUM
	{
		$$ = getUint64FromNUM($1)
	}

Int64Num:
	NUM
	{
		v, rangeErrMsg := getInt64FromNUM($1)
		if len(rangeErrMsg) != 0 {
			yylex.AppendError(yylex.Errorf(rangeErrMsg))
			return 1
		}
		$$ = v
	}

NUM:
	intLit

Boolean:
	NUM
	{
		$$ = $1.(int64) != 0
	}
|	"FALSE"
	{
		$$ = false
	}
|	"TRUE"
	{
		$$ = true
	}

OptionLevel:
	"OFF"
	{
		$$ = ast.BRIEOptionLevelOff
	}
|	"OPTIONAL"
	{
		$$ = ast.BRIEOptionLevelOptional
	}
|	"REQUIRED"
	{
		$$ = ast.BRIEOptionLevelRequired
	}

PurgeImportStmt:
	"PURGE" "IMPORT" NUM
	{
		$$ = &ast.PurgeImportStmt{TaskID: getUint64FromNUM($3)}
	}

Expression:
	singleAtIdentifier assignmentEq Expression %prec assignmentEq
	{
		v := $1
		v = strings.TrimPrefix(v, "@")
		$$ = &ast.VariableExpr{
			Name:     v,
			IsGlobal: false,
			IsSystem: false,
			Value:    $3,
		}
	}
|	Expression logOr Expression %prec pipes
	{
		$$ = &ast.BinaryOperationExpr{Op: opcode.LogicOr, L: $1, R: $3}
	}
|	Expression "XOR" Expression %prec xor
	{
		$$ = &ast.BinaryOperationExpr{Op: opcode.LogicXor, L: $1, R: $3}
	}
|	Expression logAnd Expression %prec andand
	{
		$$ = &ast.BinaryOperationExpr{Op: opcode.LogicAnd, L: $1, R: $3}
	}
|	"NOT" Expression %prec not
	{
		expr, ok := $2.(*ast.ExistsSubqueryExpr)
		if ok {
			expr.Not = true
			$$ = $2
		} else {
			$$ = &ast.UnaryOperationExpr{Op: opcode.Not, V: $2}
		}
	}
|	"MATCH" '(' ColumnNameList ')' "AGAINST" '(' BitExpr FulltextSearchModifierOpt ')'
	{
		$$ = &ast.MatchAgainst{
			ColumnNames: $3.([]*ast.ColumnName),
			Against:     $7,
			Modifier:    ast.FulltextSearchModifier($8.(int)),
		}
	}
|	BoolPri IsOrNotOp trueKwd %prec is
	{
		$$ = &ast.IsTruthExpr{Expr: $1, Not: !$2.(bool), True: int64(1)}
	}
|	BoolPri IsOrNotOp falseKwd %prec is
	{
		$$ = &ast.IsTruthExpr{Expr: $1, Not: !$2.(bool), True: int64(0)}
	}
|	BoolPri IsOrNotOp "UNKNOWN" %prec is
	{
		/* https://dev.mysql.com/doc/refman/5.7/en/comparison-operators.html#operator_is */
		$$ = &ast.IsNullExpr{Expr: $1, Not: !$2.(bool)}
	}
|	BoolPri

MaxValueOrExpression:
	"MAXVALUE"
	{
		$$ = &ast.MaxValueExpr{}
	}
|	BitExpr

FulltextSearchModifierOpt:
	/* empty */
	{
		$$ = ast.FulltextSearchModifierNaturalLanguageMode
	}
|	"IN" "NATURAL" "LANGUAGE" "MODE"
	{
		$$ = ast.FulltextSearchModifierNaturalLanguageMode
	}
|	"IN" "NATURAL" "LANGUAGE" "MODE" "WITH" "QUERY" "EXPANSION"
	{
		$$ = ast.FulltextSearchModifierNaturalLanguageMode | ast.FulltextSearchModifierWithQueryExpansion
	}
|	"IN" "BOOLEAN" "MODE"
	{
		$$ = ast.FulltextSearchModifierBooleanMode
	}
|	"WITH" "QUERY" "EXPANSION"
	{
		$$ = ast.FulltextSearchModifierWithQueryExpansion
	}

logOr:
	pipesAsOr
|	"OR"

logAnd:
	"&&"
|	"AND"

ExpressionList:
	Expression
	{
		$$ = []ast.ExprNode{$1}
	}
|	ExpressionList ',' Expression
	{
		$$ = append($1.([]ast.ExprNode), $3)
	}

MaxValueOrExpressionList:
	MaxValueOrExpression
	{
		$$ = []ast.ExprNode{$1}
	}
|	MaxValueOrExpressionList ',' MaxValueOrExpression
	{
		$$ = append($1.([]ast.ExprNode), $3)
	}

ExpressionListOpt:
	{
		$$ = []ast.ExprNode{}
	}
|	ExpressionList

FuncDatetimePrecListOpt:
	{
		$$ = []ast.ExprNode{}
	}
|	FuncDatetimePrecList

FuncDatetimePrecList:
	intLit
	{
		expr := ast.NewValueExpr($1, parser.charset, parser.collation)
		$$ = []ast.ExprNode{expr}
	}

BoolPri:
	BoolPri IsOrNotOp "NULL" %prec is
	{
		$$ = &ast.IsNullExpr{Expr: $1, Not: !$2.(bool)}
	}
|	BoolPri CompareOp PredicateExpr %prec eq
	{
		$$ = &ast.BinaryOperationExpr{Op: $2.(opcode.Op), L: $1, R: $3}
	}
|	BoolPri CompareOp AnyOrAll SubSelect %prec eq
	{
		sq := $4.(*ast.SubqueryExpr)
		sq.MultiRows = true
		$$ = &ast.CompareSubqueryExpr{Op: $2.(opcode.Op), L: $1, R: sq, All: $3.(bool)}
	}
|	BoolPri CompareOp singleAtIdentifier assignmentEq PredicateExpr %prec assignmentEq
	{
		v := $3
		v = strings.TrimPrefix(v, "@")
		variable := &ast.VariableExpr{
			Name:     v,
			IsGlobal: false,
			IsSystem: false,
			Value:    $5,
		}
		$$ = &ast.BinaryOperationExpr{Op: $2.(opcode.Op), L: $1, R: variable}
	}
|	PredicateExpr

CompareOp:
	">="
	{
		$$ = opcode.GE
	}
|	'>'
	{
		$$ = opcode.GT
	}
|	"<="
	{
		$$ = opcode.LE
	}
|	'<'
	{
		$$ = opcode.LT
	}
|	"!="
	{
		$$ = opcode.NE
	}
|	"<>"
	{
		$$ = opcode.NE
	}
|	"="
	{
		$$ = opcode.EQ
	}
|	"<=>"
	{
		$$ = opcode.NullEQ
	}

BetweenOrNotOp:
	"BETWEEN"
	{
		$$ = true
	}
|	NotSym "BETWEEN"
	{
		$$ = false
	}

IsOrNotOp:
	"IS"
	{
		$$ = true
	}
|	"IS" NotSym
	{
		$$ = false
	}

InOrNotOp:
	"IN"
	{
		$$ = true
	}
|	NotSym "IN"
	{
		$$ = false
	}

LikeOrNotOp:
	"LIKE"
	{
		$$ = true
	}
|	NotSym "LIKE"
	{
		$$ = false
	}

RegexpOrNotOp:
	RegexpSym
	{
		$$ = true
	}
|	NotSym RegexpSym
	{
		$$ = false
	}

AnyOrAll:
	"ANY"
	{
		$$ = false
	}
|	"SOME"
	{
		$$ = false
	}
|	"ALL"
	{
		$$ = true
	}

PredicateExpr:
	BitExpr InOrNotOp '(' ExpressionList ')'
	{
		$$ = &ast.PatternInExpr{Expr: $1, Not: !$2.(bool), List: $4.([]ast.ExprNode)}
	}
|	BitExpr InOrNotOp SubSelect
	{
		sq := $3.(*ast.SubqueryExpr)
		sq.MultiRows = true
		$$ = &ast.PatternInExpr{Expr: $1, Not: !$2.(bool), Sel: sq}
	}
|	BitExpr BetweenOrNotOp BitExpr "AND" PredicateExpr
	{
		$$ = &ast.BetweenExpr{
			Expr:  $1,
			Left:  $3,
			Right: $5,
			Not:   !$2.(bool),
		}
	}
|	BitExpr LikeOrNotOp SimpleExpr LikeEscapeOpt
	{
		escape := $4
		if len(escape) > 1 {
			yylex.AppendError(ErrWrongArguments.GenWithStackByArgs("ESCAPE"))
			return 1
		} else if len(escape) == 0 {
			escape = "\\"
		}
		$$ = &ast.PatternLikeExpr{
			Expr:    $1,
			Pattern: $3,
			Not:     !$2.(bool),
			Escape:  escape[0],
		}
	}
|	BitExpr RegexpOrNotOp SimpleExpr
	{
		$$ = &ast.PatternRegexpExpr{Expr: $1, Pattern: $3, Not: !$2.(bool)}
	}
|	BitExpr

RegexpSym:
	"REGEXP"
|	"RLIKE"

LikeEscapeOpt:
	%prec empty
	{
		$$ = "\\"
	}
|	"ESCAPE" stringLit
	{
		$$ = $2
	}

Field:
	'*'
	{
		$$ = &ast.SelectField{WildCard: &ast.WildCardField{}}
	}
|	Identifier '.' '*'
	{
		wildCard := &ast.WildCardField{Table: model.NewCIStr($1)}
		$$ = &ast.SelectField{WildCard: wildCard}
	}
|	Identifier '.' Identifier '.' '*'
	{
		wildCard := &ast.WildCardField{Schema: model.NewCIStr($1), Table: model.NewCIStr($3)}
		$$ = &ast.SelectField{WildCard: wildCard}
	}
|	Expression FieldAsNameOpt
	{
		expr := $1
		asName := $2
		$$ = &ast.SelectField{Expr: expr, AsName: model.NewCIStr(asName)}
	}
|	'{' Identifier Expression '}' FieldAsNameOpt
	{
		/*
		 * ODBC escape syntax.
		 * See https://dev.mysql.com/doc/refman/5.7/en/expressions.html
		 */
		expr := $3
		asName := $5
		$$ = &ast.SelectField{Expr: expr, AsName: model.NewCIStr(asName)}
	}

FieldAsNameOpt:
	/* EMPTY */
	{
		$$ = ""
	}
|	FieldAsName

FieldAsName:
	Identifier
|	"AS" Identifier
	{
		$$ = $2
	}
|	stringLit
|	"AS" stringLit
	{
		$$ = $2
	}

FieldList:
	Field
	{
		field := $1.(*ast.SelectField)
		field.Offset = parser.startOffset(&yyS[yypt])
		$$ = []*ast.SelectField{field}
	}
|	FieldList ',' Field
	{
		fl := $1.([]*ast.SelectField)
		last := fl[len(fl)-1]
		if last.Expr != nil && last.AsName.O == "" {
			lastEnd := parser.endOffset(&yyS[yypt-1])
			last.SetText(parser.src[last.Offset:lastEnd])
		}
		newField := $3.(*ast.SelectField)
		newField.Offset = parser.startOffset(&yyS[yypt])
		$$ = append(fl, newField)
	}

GroupByClause:
	"GROUP" "BY" ByList
	{
		$$ = &ast.GroupByClause{Items: $3.([]*ast.ByItem)}
	}

HavingClause:
	{
		$$ = nil
	}
|	"HAVING" Expression
	{
		$$ = &ast.HavingClause{Expr: $2}
	}

IfExists:
	{
		$$ = false
	}
|	"IF" "EXISTS"
	{
		$$ = true
	}

IfNotExists:
	{
		$$ = false
	}
|	"IF" NotSym "EXISTS"
	{
		$$ = true
	}

IgnoreOptional:
	{
		$$ = false
	}
|	"IGNORE"
	{
		$$ = true
	}

IndexName:
	{
		$$ = &ast.NullString{
			String: "",
			Empty:  false,
		}
	}
|	Identifier
	{
		$$ = &ast.NullString{
			String: $1,
			Empty:  len($1) == 0,
		}
	}

IndexOptionList:
	{
		$$ = nil
	}
|	IndexOptionList IndexOption
	{
		// Merge the options
		if $1 == nil {
			$$ = $2
		} else {
			opt1 := $1.(*ast.IndexOption)
			opt2 := $2.(*ast.IndexOption)
			if len(opt2.Comment) > 0 {
				opt1.Comment = opt2.Comment
			} else if opt2.Tp != 0 {
				opt1.Tp = opt2.Tp
			} else if opt2.KeyBlockSize > 0 {
				opt1.KeyBlockSize = opt2.KeyBlockSize
			} else if len(opt2.ParserName.O) > 0 {
				opt1.ParserName = opt2.ParserName
			} else if opt2.Visibility != ast.IndexVisibilityDefault {
				opt1.Visibility = opt2.Visibility
			}
			$$ = opt1
		}
	}

IndexOption:
	"KEY_BLOCK_SIZE" EqOpt LengthNum
	{
		$$ = &ast.IndexOption{
			KeyBlockSize: $3.(uint64),
		}
	}
|	IndexType
	{
		$$ = &ast.IndexOption{
			Tp: $1.(model.IndexType),
		}
	}
|	"WITH" "PARSER" Identifier
	{
		$$ = &ast.IndexOption{
			ParserName: model.NewCIStr($3),
		}
		yylex.AppendError(yylex.Errorf("The WITH PARASER clause is parsed but ignored by all storage engines."))
		parser.lastErrorAsWarn()
	}
|	"COMMENT" stringLit
	{
		$$ = &ast.IndexOption{
			Comment: $2,
		}
	}
|	IndexInvisible
	{
		$$ = &ast.IndexOption{
			Visibility: $1.(ast.IndexVisibility),
		}
	}

/*
  See: https://github.com/mysql/mysql-server/blob/8.0/sql/sql_yacc.yy#L7179

  The syntax for defining an index is:

    ... INDEX [index_name] [USING|TYPE] <index_type> ...

  The problem is that whereas USING is a reserved word, TYPE is not. We can
  still handle it if an index name is supplied, i.e.:

    ... INDEX type TYPE <index_type> ...

  here the index's name is unmbiguously 'type', but for this:

    ... INDEX TYPE <index_type> ...

  it's impossible to know what this actually mean - is 'type' the name or the
  type? For this reason we accept the TYPE syntax only if a name is supplied.
*/
IndexNameAndTypeOpt:
	IndexName
	{
		$$ = []interface{}{$1, nil}
	}
|	IndexName "USING" IndexTypeName
	{
		$$ = []interface{}{$1, $3}
	}
|	Identifier "TYPE" IndexTypeName
	{
		$$ = []interface{}{&ast.NullString{String: $1, Empty: len($1) == 0}, $3}
	}

IndexTypeOpt:
	{
		$$ = nil
	}
|	IndexType

IndexType:
	"USING" IndexTypeName
	{
		$$ = $2
	}
|	"TYPE" IndexTypeName
	{
		$$ = $2
	}

IndexTypeName:
	"BTREE"
	{
		$$ = model.IndexTypeBtree
	}
|	"HASH"
	{
		$$ = model.IndexTypeHash
	}
|	"RTREE"
	{
		$$ = model.IndexTypeRtree
	}

IndexInvisible:
	"VISIBLE"
	{
		$$ = ast.IndexVisibilityVisible
	}
|	"INVISIBLE"
	{
		$$ = ast.IndexVisibilityInvisible
	}

/**********************************Identifier********************************************/
Identifier:
	identifier
|	UnReservedKeyword
|	NotKeywordToken
|	TiDBKeyword

UnReservedKeyword:
	"ACTION"
|	"ADVISE"
|	"ASCII"
|	"AUTO_ID_CACHE"
|	"AUTO_INCREMENT"
|	"AFTER"
|	"ALWAYS"
|	"AVG"
|	"BEGIN"
|	"BIT"
|	"BOOL"
|	"BOOLEAN"
|	"BTREE"
|	"BYTE"
|	"CAPTURE"
|	"CLEANUP"
|	"CHAIN"
|	"CHARSET"
|	"COLUMNS"
|	"CONFIG"
|	"SAN"
|	"COMMIT"
|	"COMPACT"
|	"COMPRESSED"
|	"CONSISTENT"
|	"CURRENT"
|	"DATA"
|	"DATE" %prec lowerThanStringLitToken
|	"DATETIME"
|	"DAY"
|	"DEALLOCATE"
|	"DO"
|	"DUPLICATE"
|	"DYNAMIC"
|	"ENCRYPTION"
|	"END"
|	"ENFORCED"
|	"ENGINE"
|	"ENGINES"
|	"ENUM"
|	"ERROR"
|	"ERRORS"
|	"ESCAPE"
|	"EVOLVE"
|	"EXECUTE"
|	"EXTENDED"
|	"FIELDS"
|	"FILE"
|	"FIRST"
|	"FIXED"
|	"FLUSH"
|	"FOLLOWING"
|	"FORMAT"
|	"FULL"
|	"GENERAL"
|	"GLOBAL"
|	"HASH"
|	"HOUR"
|	"INSERT_METHOD"
|	"LESS"
|	"LOCAL"
|	"LAST"
|	"NAMES"
|	"NVARCHAR"
|	"OFFSET"
|	"PACK_KEYS"
|	"PARSER"
|	"PASSWORD" %prec lowerThanEq
|	"PREPARE"
|	"PRE_SPLIT_REGIONS"
|	"PROXY"
|	"QUICK"
|	"REBUILD"
|	"REDUNDANT"
|	"REORGANIZE"
|	"RESTART"
|	"ROLE"
|	"ROLLBACK"
|	"SESSION"
|	"SIGNED"
|	"SHARD_ROW_ID_BITS"
|	"SHUTDOWN"
|	"SNAPSHOT"
|	"START"
|	"STATUS"
|	"OPEN"
|	"SUBPARTITIONS"
|	"SUBPARTITION"
|	"TABLES"
|	"TABLESPACE"
|	"TEXT"
|	"THAN"
|	"TIME" %prec lowerThanStringLitToken
|	"TIMESTAMP" %prec lowerThanStringLitToken
|	"TRACE"
|	"TRANSACTION"
|	"TRUNCATE"
|	"UNBOUNDED"
|	"UNKNOWN"
|	"VALUE" %prec lowerThanValueKeyword
|	"WARNINGS"
|	"YEAR"
|	"MODE"
|	"WEEK"
|	"WEIGHT_STRING"
|	"ANY"
|	"SOME"
|	"USER"
|	"IDENTIFIED"
|	"COLLATION"
|	"COMMENT"
|	"AVG_ROW_LENGTH"
|	"CONNECTION"
|	"CHECKSUM"
|	"COMPRESSION"
|	"KEY_BLOCK_SIZE"
|	"MASTER"
|	"MAX_ROWS"
|	"MIN_ROWS"
|	"NATIONAL"
|	"NCHAR"
|	"ROW_FORMAT"
|	"QUARTER"
|	"GRANTS"
|	"TRIGGERS"
|	"DELAY_KEY_WRITE"
|	"ISOLATION"
|	"JSON"
|	"REPEATABLE"
|	"RESPECT"
|	"COMMITTED"
|	"UNCOMMITTED"
|	"ONLY"
|	"SERIAL"
|	"SERIALIZABLE"
|	"LEVEL"
|	"VARIABLES"
|	"SQL_CACHE"
|	"INDEXES"
|	"PROCESSLIST"
|	"SQL_NO_CACHE"
|	"DISABLE"
|	"ENABLE"
|	"REVERSE"
|	"PRIVILEGES"
|	"NO"
|	"BINLOG"
|	"FUNCTION"
|	"VIEW"
|	"BINDING"
|	"BINDINGS"
|	"MODIFY"
|	"EVENTS"
|	"PARTITIONS"
|	"NONE"
|	"NULLS"
|	"SUPER"
|	"EXCLUSIVE"
|	"STATS_PERSISTENT"
|	"STATS_AUTO_RECALC"
|	"ROW_COUNT"
|	"COALESCE"
|	"MONTH"
|	"PROCESS"
|	"PROFILE"
|	"PROFILES"
|	"MICROSECOND"
|	"MINUTE"
|	"PLUGINS"
|	"PRECEDING"
|	"QUERY"
|	"QUERIES"
|	"SECOND"
|	"SEPARATOR"
|	"SHARE"
|	"SHARED"
|	"SLOW"
|	"MAX_CONNECTIONS_PER_HOUR"
|	"MAX_QUERIES_PER_HOUR"
|	"MAX_UPDATES_PER_HOUR"
|	"MAX_USER_CONNECTIONS"
|	"REPLICATION"
|	"CLIENT"
|	"SLAVE"
|	"RELOAD"
|	"TEMPORARY"
|	"ROUTINE"
|	"EVENT"
|	"ALGORITHM"
|	"DEFINER"
|	"INVOKER"
|	"MERGE"
|	"TEMPTABLE"
|	"UNDEFINED"
|	"SECURITY"
|	"CASCADED"
|	"RECOVER"
|	"CIPHER"
|	"SUBJECT"
|	"ISSUER"
|	"X509"
|	"NEVER"
|	"EXPIRE"
|	"ACCOUNT"
|	"INCREMENTAL"
|	"CPU"
|	"MEMORY"
|	"BLOCK"
|	"IO"
|	"CONTEXT"
|	"SWITCHES"
|	"PAGE"
|	"FAULTS"
|	"IPC"
|	"SWAPS"
|	"SOURCE"
|	"TRADITIONAL"
|	"SQL_BUFFER_RESULT"
|	"DIRECTORY"
|	"HISTOGRAM"
|	"HISTORY"
|	"LIST"
|	"NODEGROUP"
|	"SYSTEM_TIME"
|	"PARTIAL"
|	"SIMPLE"
|	"REMOVE"
|	"PARTITIONING"
|	"STORAGE"
|	"DISK"
|	"STATS_SAMPLE_PAGES"
|	"SECONDARY_ENGINE"
|	"SECONDARY_LOAD"
|	"SECONDARY_UNLOAD"
|	"VALIDATION"
|	"WITHOUT"
|	"RTREE"
|	"EXCHANGE"
|	"COLUMN_FORMAT"
|	"REPAIR"
|	"IMPORT"
|	"IMPORTS"
|	"DISCARD"
|	"TABLE_CHECKSUM"
|	"UNICODE"
|	"AUTO_RANDOM"
|	"AUTO_RANDOM_BASE"
|	"SQL_TSI_DAY"
|	"SQL_TSI_HOUR"
|	"SQL_TSI_MINUTE"
|	"SQL_TSI_MONTH"
|	"SQL_TSI_QUARTER"
|	"SQL_TSI_SECOND"
|	"LANGUAGE"
|	"SQL_TSI_WEEK"
|	"SQL_TSI_YEAR"
|	"INVISIBLE"
|	"VISIBLE"
|	"TYPE"
|	"NOWAIT"
|	"INSTANCE"
|	"REPLICA"
|	"LOCATION"
|	"LABELS"
|	"LOGS"
|	"HOSTS"
|	"AGAINST"
|	"EXPANSION"
|	"INCREMENT"
|	"MINVALUE"
|	"NOMAXVALUE"
|	"NOMINVALUE"
|	"NOCACHE"
|	"CACHE"
|	"CYCLE"
|	"NOCYCLE"
|	"SEQUENCE"
|	"MAX_MINUTES"
|	"MAX_IDXNUM"
|	"PER_TABLE"
|	"PER_DB"
|	"NEXT"
|	"NEXTVAL"
|	"LASTVAL"
|	"SETVAL"
|	"AGO"
|	"BACKUP"
|	"BACKUPS"
|	"CONCURRENCY"
|	"MB"
|	"ONLINE"
|	"RATE_LIMIT"
|	"RESTORE"
|	"RESTORES"
|	"SEND_CREDENTIALS_TO_TIKV"
|	"LAST_BACKUP"
|	"CHECKPOINT"
|	"SKIP_SCHEMA_FILES"
|	"STRICT_FORMAT"
|	"BACKEND"
|	"CSV_BACKSLASH_ESCAPE"
|	"CSV_NOT_NULL"
|	"CSV_TRIM_LAST_SEPARATORS"
|	"CSV_DELIMITER"
|	"CSV_HEADER"
|	"CSV_NULL"
|	"CSV_SEPARATOR"
|	"ON_DUPLICATE"
|	"TIKV_IMPORTER"
|	"CONSTRAINTS"
|	"REPLICAS"
|	"POLICY"
|	"WAIT"
|	"BERNOULLI"
|	"SYSTEM"
|	"PERCENT"
|	"RESUME"
|	"OFF"
|	"OPTIONAL"
|	"REQUIRED"
|	"PURGE"
|	"SKIP"
|	"LOCKED"

TiDBKeyword:
	"ADMIN"
|	"BUCKETS"
|	"BUILTINS"
|	"CANCEL"
|	"CARDINALITY"
|	"CMSKETCH"
|	"CORRELATION"
|	"DDL"
|	"DEPENDENCY"
|	"DEPTH"
|	"DRAINER"
|	"JOBS"
|	"JOB"
|	"NODE_ID"
|	"NODE_STATE"
|	"PUMP"
|	"SAMPLES"
|	"STATISTICS"
|	"STATS"
|	"STATS_META"
|	"STATS_HISTOGRAMS"
|	"STATS_TOPN"
|	"STATS_BUCKETS"
|	"STATS_HEALTHY"
|	"TELEMETRY"
|	"TELEMETRY_ID"
|	"TIDB"
|	"TIFLASH"
|	"TOPN"
|	"SPLIT"
|	"TAG"
|	"EDGE"
|	"OPTIMISTIC"
|	"PESSIMISTIC"
|	"WIDTH"
|	"REGIONS"
|	"REGION"
|	"RESET"

NotKeywordToken:
	"ADDDATE"
|	"APPROX_COUNT_DISTINCT"
|	"APPROX_PERCENTILE"
|	"BIT_AND"
|	"BIT_OR"
|	"BIT_XOR"
|	"CAST"
|	"COPY"
|	"CURTIME"
|	"DATE_ADD"
|	"DATE_SUB"
|	"EXTRACT"
|	"GET_FORMAT"
|	"GROUP_CONCAT"
|	"INPLACE"
|	"INSTANT"
|	"INTERNAL"
|	"MIN"
|	"MAX"
|	"NOW"
|	"RECENT"
|	"POSITION"
|	"S3"
|	"SUBDATE"
|	"SUBSTRING"
|	"SUM"
|	"STD"
|	"STDDEV"
|	"STDDEV_POP"
|	"STDDEV_SAMP"
|	"VARIANCE"
|	"VAR_POP"
|	"VAR_SAMP"
|	"TIMESTAMPADD"
|	"TIMESTAMPDIFF"
|	"TOKUDB_DEFAULT"
|	"TOKUDB_FAST"
|	"TOKUDB_LZMA"
|	"TOKUDB_QUICKLZ"
|	"TOKUDB_SNAPPY"
|	"TOKUDB_SMALL"
|	"TOKUDB_UNCOMPRESSED"
|	"TOKUDB_ZLIB"
|	"TOP"
|	"TRIM"
|	"NEXT_ROW_ID"
|	"EXPR_PUSHDOWN_BLACKLIST"
|	"OPT_RULE_BLACKLIST"
|	"BOUND"
|	"EXACT"
|	"STALENESS"
|	"STRONG"
|	"FLASHBACK"
|	"JSON_OBJECTAGG"
|	"JSON_ARRAYAGG"
|	"TLS"
|	"FOLLOWER"
|	"LEADER"
|	"LEARNER"
|	"VOTER"

/************************************************************************************
 *
 *  Call Statements
 *
 **********************************************************************************/
CallStmt:
	"CALL" ProcedureCall
	{
		$$ = &ast.CallStmt{
			Procedure: $2.(*ast.FuncCallExpr),
		}
	}

ProcedureCall:
	identifier
	{
		$$ = &ast.FuncCallExpr{
			Tp:     ast.FuncCallExprTypeGeneric,
			FnName: model.NewCIStr($1),
			Args:   []ast.ExprNode{},
		}
	}
|	Identifier '.' Identifier
	{
		$$ = &ast.FuncCallExpr{
			Tp:     ast.FuncCallExprTypeGeneric,
			Schema: model.NewCIStr($1),
			FnName: model.NewCIStr($3),
			Args:   []ast.ExprNode{},
		}
	}
|	identifier '(' ExpressionListOpt ')'
	{
		$$ = &ast.FuncCallExpr{
			Tp:     ast.FuncCallExprTypeGeneric,
			FnName: model.NewCIStr($1),
			Args:   $3.([]ast.ExprNode),
		}
	}
|	Identifier '.' Identifier '(' ExpressionListOpt ')'
	{
		$$ = &ast.FuncCallExpr{
			Tp:     ast.FuncCallExprTypeGeneric,
			Schema: model.NewCIStr($1),
			FnName: model.NewCIStr($3),
			Args:   $5.([]ast.ExprNode),
		}
	}

/************************************************************************************
 *
 *  Insert Statements
 *
 *  TODO: support PARTITION
 **********************************************************************************/
InsertIntoStmt:
	"INSERT" TableOptimizerHintsOpt PriorityOpt IgnoreOptional IntoOpt TableName PartitionNameListOpt InsertValues OnDuplicateKeyUpdate
	{
		x := $8.(*ast.InsertStmt)
		x.Priority = $3.(mysql.PriorityEnum)
		x.IgnoreErr = $4.(bool)
		// Wraps many layers here so that it can be processed the same way as select statement.
		ts := &ast.TableSource{Source: $6.(*ast.TableName)}
		x.Table = &ast.TableRefsClause{TableRefs: &ast.Join{Left: ts}}
		if $9 != nil {
			x.OnDuplicate = $9.([]*ast.Assignment)
		}
		if $2 != nil {
			x.TableHints = $2.([]*ast.TableOptimizerHint)
		}
		x.PartitionNames = $7.([]model.CIStr)
		$$ = x
	}

IntoOpt:
	{}
|	"INTO"

InsertValues:
	'(' ColumnNameListOpt ')' ValueSym ValuesList
	{
		$$ = &ast.InsertStmt{
			Columns: $2.([]*ast.ColumnName),
			Lists:   $5.([][]ast.ExprNode),
		}
	}
|	'(' ColumnNameListOpt ')' SetOprStmt1
	{
		$$ = &ast.InsertStmt{Columns: $2.([]*ast.ColumnName), Select: $4.(ast.ResultSetNode)}
	}
|	ValueSym ValuesList %prec insertValues
	{
		$$ = &ast.InsertStmt{Lists: $2.([][]ast.ExprNode)}
	}
|	SetOprStmt1
	{
		$$ = &ast.InsertStmt{Select: $1.(ast.ResultSetNode)}
	}
|	"SET" ColumnSetValueList
	{
		$$ = &ast.InsertStmt{Setlist: $2.([]*ast.Assignment)}
	}

ValueSym:
	"VALUE"
|	"VALUES"

ValuesList:
	RowValue
	{
		$$ = [][]ast.ExprNode{$1.([]ast.ExprNode)}
	}
|	ValuesList ',' RowValue
	{
		$$ = append($1.([][]ast.ExprNode), $3.([]ast.ExprNode))
	}

RowValue:
	'(' ValuesOpt ')'
	{
		$$ = $2
	}

ValuesOpt:
	{
		$$ = []ast.ExprNode{}
	}
|	Values

Values:
	Values ',' ExprOrDefault
	{
		$$ = append($1.([]ast.ExprNode), $3)
	}
|	ExprOrDefault
	{
		$$ = []ast.ExprNode{$1}
	}

ExprOrDefault:
	Expression
|	"DEFAULT"
	{
		$$ = &ast.DefaultExpr{}
	}

ColumnSetValue:
	ColumnName eq ExprOrDefault
	{
		$$ = &ast.Assignment{
			Column: $1.(*ast.ColumnName),
			Expr:   $3,
		}
	}

ColumnSetValueList:
	{
		$$ = []*ast.Assignment{}
	}
|	ColumnSetValue
	{
		$$ = []*ast.Assignment{$1.(*ast.Assignment)}
	}
|	ColumnSetValueList ',' ColumnSetValue
	{
		$$ = append($1.([]*ast.Assignment), $3.(*ast.Assignment))
	}

/*
 * ON DUPLICATE KEY UPDATE col_name=expr [, col_name=expr] ...
 * See https://dev.mysql.com/doc/refman/5.7/en/insert-on-duplicate.html
 */
OnDuplicateKeyUpdate:
	{
		$$ = nil
	}
|	"ON" "DUPLICATE" "KEY" "UPDATE" AssignmentList
	{
		$$ = $5
	}

/************************************************************************************
 *  Replace Statements
 *  See https://dev.mysql.com/doc/refman/5.7/en/replace.html
 *
 *  TODO: support PARTITION
 **********************************************************************************/
ReplaceIntoStmt:
	"REPLACE" PriorityOpt IntoOpt TableName PartitionNameListOpt InsertValues
	{
		x := $6.(*ast.InsertStmt)
		x.IsReplace = true
		x.Priority = $2.(mysql.PriorityEnum)
		ts := &ast.TableSource{Source: $4.(*ast.TableName)}
		x.Table = &ast.TableRefsClause{TableRefs: &ast.Join{Left: ts}}
		x.PartitionNames = $5.([]model.CIStr)
		$$ = x
	}

ODBCDateTimeType:
	"d"
	{
		$$ = ast.DateLiteral
	}
|	"t"
	{
		$$ = ast.TimeLiteral
	}
|	"ts"
	{
		$$ = ast.TimestampLiteral
	}

Literal:
	"FALSE"
	{
		$$ = ast.NewValueExpr(false, parser.charset, parser.collation)
	}
|	"NULL"
	{
		$$ = ast.NewValueExpr(nil, parser.charset, parser.collation)
	}
|	"TRUE"
	{
		$$ = ast.NewValueExpr(true, parser.charset, parser.collation)
	}
|	floatLit
	{
		$$ = ast.NewValueExpr($1, parser.charset, parser.collation)
	}
|	decLit
	{
		$$ = ast.NewValueExpr($1, parser.charset, parser.collation)
	}
|	intLit
	{
		$$ = ast.NewValueExpr($1, parser.charset, parser.collation)
	}
|	StringLiteral %prec lowerThanStringLitToken
|	"UNDERSCORE_CHARSET" stringLit
	{
		// See https://dev.mysql.com/doc/refman/5.7/en/charset-literal.html
		co, err := charset.GetDefaultCollation($1)
		if err != nil {
			yylex.AppendError(yylex.Errorf("Get collation error for charset: %s", $1))
			return 1
		}
		expr := ast.NewValueExpr($2, parser.charset, parser.collation)
		tp := expr.GetType()
		tp.Charset = $1
		tp.Collate = co
		if tp.Collate == charset.CollationBin {
			tp.Flag |= mysql.BinaryFlag
		}
		$$ = expr
	}
|	hexLit
	{
		$$ = ast.NewValueExpr($1, parser.charset, parser.collation)
	}
|	bitLit
	{
		$$ = ast.NewValueExpr($1, parser.charset, parser.collation)
	}
|	"UNDERSCORE_CHARSET" hexLit
	{
		co, err := charset.GetDefaultCollation($1)
		if err != nil {
			yylex.AppendError(yylex.Errorf("Get collation error for charset: %s", $1))
			return 1
		}
		expr := ast.NewValueExpr($2, parser.charset, parser.collation)
		tp := expr.GetType()
		tp.Charset = $1
		tp.Collate = co
		if tp.Collate == charset.CollationBin {
			tp.Flag |= mysql.BinaryFlag
		}
		$$ = expr
	}
|	"UNDERSCORE_CHARSET" bitLit
	{
		co, err := charset.GetDefaultCollation($1)
		if err != nil {
			yylex.AppendError(yylex.Errorf("Get collation error for charset: %s", $1))
			return 1
		}
		expr := ast.NewValueExpr($2, parser.charset, parser.collation)
		tp := expr.GetType()
		tp.Charset = $1
		tp.Collate = co
		if tp.Collate == charset.CollationBin {
			tp.Flag |= mysql.BinaryFlag
		}
		$$ = expr
	}

StringLiteral:
	stringLit
	{
		expr := ast.NewValueExpr($1, parser.charset, parser.collation)
		$$ = expr
	}
|	StringLiteral stringLit
	{
		valExpr := $1.(ast.ValueExpr)
		strLit := valExpr.GetString()
		expr := ast.NewValueExpr(strLit+$2, parser.charset, parser.collation)
		// Fix #4239, use first string literal as projection name.
		if valExpr.GetProjectionOffset() >= 0 {
			expr.SetProjectionOffset(valExpr.GetProjectionOffset())
		} else {
			expr.SetProjectionOffset(len(strLit))
		}
		$$ = expr
	}

AlterOrderList:
	AlterOrderItem
	{
		$$ = []*ast.AlterOrderItem{$1.(*ast.AlterOrderItem)}
	}
|	AlterOrderList ',' AlterOrderItem
	{
		$$ = append($1.([]*ast.AlterOrderItem), $3.(*ast.AlterOrderItem))
	}

AlterOrderItem:
	ColumnName OptOrder
	{
		$$ = &ast.AlterOrderItem{Column: $1.(*ast.ColumnName), Desc: $2.(bool)}
	}

OrderBy:
	"ORDER" "BY" ByList
	{
		$$ = &ast.OrderByClause{Items: $3.([]*ast.ByItem)}
	}

ByList:
	ByItem
	{
		$$ = []*ast.ByItem{$1.(*ast.ByItem)}
	}
|	ByList ',' ByItem
	{
		$$ = append($1.([]*ast.ByItem), $3.(*ast.ByItem))
	}

ByItem:
	Expression
	{
		expr := $1
		valueExpr, ok := expr.(ast.ValueExpr)
		if ok {
			position, isPosition := valueExpr.GetValue().(int64)
			if isPosition {
				expr = &ast.PositionExpr{N: int(position)}
			}
		}
		$$ = &ast.ByItem{Expr: expr, NullOrder: true}
	}
|	Expression Order
	{
		expr := $1
		valueExpr, ok := expr.(ast.ValueExpr)
		if ok {
			position, isPosition := valueExpr.GetValue().(int64)
			if isPosition {
				expr = &ast.PositionExpr{N: int(position)}
			}
		}
		$$ = &ast.ByItem{Expr: expr, Desc: $2.(bool)}
	}

Order:
	"ASC"
	{
		$$ = false
	}
|	"DESC"
	{
		$$ = true
	}

OptOrder:
	/* EMPTY */
	{
		$$ = false // ASC by default
	}
|	"ASC"
	{
		$$ = false
	}
|	"DESC"
	{
		$$ = true
	}

OrderByOptional:
	{
		$$ = nil
	}
|	OrderBy

BitExpr:
	BitExpr '|' BitExpr %prec '|'
	{
		$$ = &ast.BinaryOperationExpr{Op: opcode.Or, L: $1, R: $3}
	}
|	BitExpr '&' BitExpr %prec '&'
	{
		$$ = &ast.BinaryOperationExpr{Op: opcode.And, L: $1, R: $3}
	}
|	BitExpr "<<" BitExpr %prec lsh
	{
		$$ = &ast.BinaryOperationExpr{Op: opcode.LeftShift, L: $1, R: $3}
	}
|	BitExpr ">>" BitExpr %prec rsh
	{
		$$ = &ast.BinaryOperationExpr{Op: opcode.RightShift, L: $1, R: $3}
	}
|	BitExpr '+' BitExpr %prec '+'
	{
		$$ = &ast.BinaryOperationExpr{Op: opcode.Plus, L: $1, R: $3}
	}
|	BitExpr '-' BitExpr %prec '-'
	{
		$$ = &ast.BinaryOperationExpr{Op: opcode.Minus, L: $1, R: $3}
	}
|	BitExpr '+' "INTERVAL" Expression TimeUnit %prec '+'
	{
		$$ = &ast.FuncCallExpr{
			FnName: model.NewCIStr("DATE_ADD"),
			Args: []ast.ExprNode{
				$1,
				$4,
				&ast.TimeUnitExpr{Unit: $5.(ast.TimeUnitType)},
			},
		}
	}
|	BitExpr '-' "INTERVAL" Expression TimeUnit %prec '+'
	{
		$$ = &ast.FuncCallExpr{
			FnName: model.NewCIStr("DATE_SUB"),
			Args: []ast.ExprNode{
				$1,
				$4,
				&ast.TimeUnitExpr{Unit: $5.(ast.TimeUnitType)},
			},
		}
	}
|	BitExpr '*' BitExpr %prec '*'
	{
		$$ = &ast.BinaryOperationExpr{Op: opcode.Mul, L: $1, R: $3}
	}
|	BitExpr '/' BitExpr %prec '/'
	{
		$$ = &ast.BinaryOperationExpr{Op: opcode.Div, L: $1, R: $3}
	}
|	BitExpr '%' BitExpr %prec '%'
	{
		$$ = &ast.BinaryOperationExpr{Op: opcode.Mod, L: $1, R: $3}
	}
|	BitExpr "DIV" BitExpr %prec div
	{
		$$ = &ast.BinaryOperationExpr{Op: opcode.IntDiv, L: $1, R: $3}
	}
|	BitExpr "MOD" BitExpr %prec mod
	{
		$$ = &ast.BinaryOperationExpr{Op: opcode.Mod, L: $1, R: $3}
	}
|	BitExpr '^' BitExpr
	{
		$$ = &ast.BinaryOperationExpr{Op: opcode.Xor, L: $1, R: $3}
	}
|	SimpleExpr

SimpleIdent:
	Identifier
	{
		$$ = &ast.ColumnNameExpr{Name: &ast.ColumnName{
			Name: model.NewCIStr($1),
		}}
	}
|	Identifier '.' Identifier
	{
		$$ = &ast.ColumnNameExpr{Name: &ast.ColumnName{
			Table: model.NewCIStr($1),
			Name:  model.NewCIStr($3),
		}}
	}
|	Identifier '.' Identifier '.' Identifier
	{
		$$ = &ast.ColumnNameExpr{Name: &ast.ColumnName{
			Schema: model.NewCIStr($1),
			Table:  model.NewCIStr($3),
			Name:   model.NewCIStr($5),
		}}
	}

SimpleExpr:
	SimpleIdent
|	FunctionCallKeyword
|	FunctionCallNonKeyword
|	FunctionCallGeneric
|	SimpleExpr "COLLATE" CollationName
	{
		$$ = &ast.SetCollationExpr{Expr: $1, Collate: $3}
	}
|	WindowFuncCall
|	Literal
|	paramMarker
	{
		$$ = ast.NewParamMarkerExpr(yyS[yypt].offset)
	}
|	Variable
|	SumExpr
|	'!' SimpleExpr %prec neg
	{
		$$ = &ast.UnaryOperationExpr{Op: opcode.Not2, V: $2}
	}
|	'~' SimpleExpr %prec neg
	{
		$$ = &ast.UnaryOperationExpr{Op: opcode.BitNeg, V: $2}
	}
|	'-' SimpleExpr %prec neg
	{
		$$ = &ast.UnaryOperationExpr{Op: opcode.Minus, V: $2}
	}
|	'+' SimpleExpr %prec neg
	{
		$$ = &ast.UnaryOperationExpr{Op: opcode.Plus, V: $2}
	}
|	SimpleExpr pipes SimpleExpr
	{
		$$ = &ast.FuncCallExpr{FnName: model.NewCIStr(ast.Concat), Args: []ast.ExprNode{$1, $3}}
	}
|	not2 SimpleExpr %prec neg
	{
		$$ = &ast.UnaryOperationExpr{Op: opcode.Not2, V: $2}
	}
|	SubSelect2
|	'(' Expression ')'
	{
		startOffset := parser.startOffset(&yyS[yypt-1])
		endOffset := parser.endOffset(&yyS[yypt])
		expr := $2
		expr.SetText(parser.src[startOffset:endOffset])
		$$ = &ast.ParenthesesExpr{Expr: expr}
	}
|	'(' ExpressionList ',' Expression ')'
	{
		values := append($2.([]ast.ExprNode), $4)
		$$ = &ast.RowExpr{Values: values}
	}
|	"ROW" '(' ExpressionList ',' Expression ')'
	{
		values := append($3.([]ast.ExprNode), $5)
		$$ = &ast.RowExpr{Values: values}
	}
|	"EXISTS" SubSelect
	{
		sq := $2.(*ast.SubqueryExpr)
		sq.Exists = true
		$$ = &ast.ExistsSubqueryExpr{Sel: sq}
	}
|	"BINARY" SimpleExpr %prec neg
	{
		// See https://dev.mysql.com/doc/refman/5.7/en/cast-functions.html#operator_binary
		x := types.NewFieldType(mysql.TypeString)
		x.Charset = charset.CharsetBin
		x.Collate = charset.CharsetBin
		x.Flag |= mysql.BinaryFlag
		$$ = &ast.FuncCastExpr{
			Expr:         $2,
			Tp:           x,
			FunctionType: ast.CastBinaryOperator,
		}
	}
|	builtinCast '(' Expression "AS" CastType ')'
	{
		/* See https://dev.mysql.com/doc/refman/5.7/en/cast-functions.html#function_cast */
		tp := $5.(*types.FieldType)
		defaultFlen, defaultDecimal := mysql.GetDefaultFieldLengthAndDecimalForCast(tp.Tp)
		if tp.Flen == types.UnspecifiedLength {
			tp.Flen = defaultFlen
		}
		if tp.Decimal == types.UnspecifiedLength {
			tp.Decimal = defaultDecimal
		}
		explicitCharset := parser.explicitCharset
		parser.explicitCharset = false
		$$ = &ast.FuncCastExpr{
			Expr:            $3,
			Tp:              tp,
			FunctionType:    ast.CastFunction,
			ExplicitCharSet: explicitCharset,
		}
	}
|	"CASE" ExpressionOpt WhenClauseList ElseOpt "END"
	{
		x := &ast.CaseExpr{WhenClauses: $3.([]*ast.WhenClause)}
		if $2 != nil {
			x.Value = $2
		}
		if $4 != nil {
			x.ElseClause = $4.(ast.ExprNode)
		}
		$$ = x
	}
|	"CONVERT" '(' Expression ',' CastType ')'
	{
		// See https://dev.mysql.com/doc/refman/5.7/en/cast-functions.html#function_convert
		tp := $5.(*types.FieldType)
		defaultFlen, defaultDecimal := mysql.GetDefaultFieldLengthAndDecimalForCast(tp.Tp)
		if tp.Flen == types.UnspecifiedLength {
			tp.Flen = defaultFlen
		}
		if tp.Decimal == types.UnspecifiedLength {
			tp.Decimal = defaultDecimal
		}
		explicitCharset := parser.explicitCharset
		parser.explicitCharset = false
		$$ = &ast.FuncCastExpr{
			Expr:            $3,
			Tp:              tp,
			FunctionType:    ast.CastConvertFunction,
			ExplicitCharSet: explicitCharset,
		}
	}
|	"CONVERT" '(' Expression "USING" CharsetName ')'
	{
		// See https://dev.mysql.com/doc/refman/5.7/en/cast-functions.html#function_convert
		charset1 := ast.NewValueExpr($5, "", "")
		$$ = &ast.FuncCallExpr{
			FnName: model.NewCIStr($1),
			Args:   []ast.ExprNode{$3, charset1},
		}
	}
|	"DEFAULT" '(' SimpleIdent ')'
	{
		$$ = &ast.DefaultExpr{Name: $3.(*ast.ColumnNameExpr).Name}
	}
|	"VALUES" '(' SimpleIdent ')' %prec lowerThanInsertValues
	{
		$$ = &ast.ValuesExpr{Column: $3.(*ast.ColumnNameExpr)}
	}
|	SimpleIdent jss stringLit
	{
		expr := ast.NewValueExpr($3, parser.charset, parser.collation)
		$$ = &ast.FuncCallExpr{FnName: model.NewCIStr(ast.JSONExtract), Args: []ast.ExprNode{$1, expr}}
	}
|	SimpleIdent juss stringLit
	{
		expr := ast.NewValueExpr($3, parser.charset, parser.collation)
		extract := &ast.FuncCallExpr{FnName: model.NewCIStr(ast.JSONExtract), Args: []ast.ExprNode{$1, expr}}
		$$ = &ast.FuncCallExpr{FnName: model.NewCIStr(ast.JSONUnquote), Args: []ast.ExprNode{extract}}
	}

DistinctKwd:
	"DISTINCT"
|	"DISTINCTROW"

DistinctOpt:
	"ALL"
	{
		$$ = false
	}
|	DistinctKwd
	{
		$$ = true
	}

DefaultFalseDistinctOpt:
	{
		$$ = false
	}
|	DistinctOpt

DefaultTrueDistinctOpt:
	{
		$$ = true
	}
|	DistinctOpt

BuggyDefaultFalseDistinctOpt:
	DefaultFalseDistinctOpt
|	DistinctKwd "ALL"
	{
		$$ = true
	}

FunctionNameConflict:
	"ASCII"
|	"CHARSET"
|	"COALESCE"
|	"COLLATION"
|	"DATE"
|	"DATABASE"
|	"DAY"
|	"HOUR"
|	"IF"
|	"INTERVAL" %prec lowerThanIntervalKeyword
|	"FORMAT"
|	"LEFT"
|	"MICROSECOND"
|	"MINUTE"
|	"MONTH"
|	builtinNow
|	"QUARTER"
|	"REPEAT"
|	"REPLACE"
|	"REVERSE"
|	"RIGHT"
|	"ROW_COUNT"
|	"SECOND"
|	"TIME"
|	"TIMESTAMP"
|	"TRUNCATE"
|	"USER"
|	"WEEK"
|	"YEAR"

OptionalBraces:
	{}
|	'(' ')'
	{}

FunctionNameOptionalBraces:
	"CURRENT_USER"
|	"CURRENT_DATE"
|	"CURRENT_ROLE"
|	"UTC_DATE"

FunctionNameDatetimePrecision:
	"CURRENT_TIME"
|	"CURRENT_TIMESTAMP"
|	"LOCALTIME"
|	"LOCALTIMESTAMP"
|	"UTC_TIME"
|	"UTC_TIMESTAMP"

FunctionCallKeyword:
	FunctionNameConflict '(' ExpressionListOpt ')'
	{
		$$ = &ast.FuncCallExpr{FnName: model.NewCIStr($1), Args: $3.([]ast.ExprNode)}
	}
|	builtinUser '(' ExpressionListOpt ')'
	{
		$$ = &ast.FuncCallExpr{FnName: model.NewCIStr($1), Args: $3.([]ast.ExprNode)}
	}
|	FunctionNameOptionalBraces OptionalBraces
	{
		$$ = &ast.FuncCallExpr{FnName: model.NewCIStr($1)}
	}
|	builtinCurDate '(' ')'
	{
		$$ = &ast.FuncCallExpr{FnName: model.NewCIStr($1)}
	}
|	FunctionNameDatetimePrecision FuncDatetimePrec
	{
		args := []ast.ExprNode{}
		if $2 != nil {
			args = append(args, $2.(ast.ExprNode))
		}
		$$ = &ast.FuncCallExpr{FnName: model.NewCIStr($1), Args: args}
	}
|	"CHAR" '(' ExpressionList ')'
	{
		nilVal := ast.NewValueExpr(nil, parser.charset, parser.collation)
		args := $3.([]ast.ExprNode)
		$$ = &ast.FuncCallExpr{
			FnName: model.NewCIStr(ast.CharFunc),
			Args:   append(args, nilVal),
		}
	}
|	"CHAR" '(' ExpressionList "USING" CharsetName ')'
	{
		charset1 := ast.NewValueExpr($5, "", "")
		args := $3.([]ast.ExprNode)
		$$ = &ast.FuncCallExpr{
			FnName: model.NewCIStr(ast.CharFunc),
			Args:   append(args, charset1),
		}
	}
|	"DATE" stringLit
	{
		expr := ast.NewValueExpr($2, "", "")
		$$ = &ast.FuncCallExpr{FnName: model.NewCIStr(ast.DateLiteral), Args: []ast.ExprNode{expr}}
	}
|	"TIME" stringLit
	{
		expr := ast.NewValueExpr($2, "", "")
		$$ = &ast.FuncCallExpr{FnName: model.NewCIStr(ast.TimeLiteral), Args: []ast.ExprNode{expr}}
	}
|	"TIMESTAMP" stringLit
	{
		expr := ast.NewValueExpr($2, "", "")
		$$ = &ast.FuncCallExpr{FnName: model.NewCIStr(ast.TimestampLiteral), Args: []ast.ExprNode{expr}}
	}
|	"INSERT" '(' ExpressionListOpt ')'
	{
		$$ = &ast.FuncCallExpr{FnName: model.NewCIStr(ast.InsertFunc), Args: $3.([]ast.ExprNode)}
	}
|	"MOD" '(' BitExpr ',' BitExpr ')'
	{
		$$ = &ast.BinaryOperationExpr{Op: opcode.Mod, L: $3, R: $5}
	}
|	"PASSWORD" '(' ExpressionListOpt ')'
	{
		$$ = &ast.FuncCallExpr{FnName: model.NewCIStr(ast.PasswordFunc), Args: $3.([]ast.ExprNode)}
	}
|	'{' ODBCDateTimeType stringLit '}'
	{
		// This is ODBC syntax for date and time literals.
		// See: https://dev.mysql.com/doc/refman/5.7/en/date-and-time-literals.html
		expr := ast.NewValueExpr($3, parser.charset, parser.collation)
		$$ = &ast.FuncCallExpr{FnName: model.NewCIStr($2), Args: []ast.ExprNode{expr}}
	}

FunctionCallNonKeyword:
	builtinCurTime '(' FuncDatetimePrecListOpt ')'
	{
		$$ = &ast.FuncCallExpr{FnName: model.NewCIStr($1), Args: $3.([]ast.ExprNode)}
	}
|	builtinSysDate '(' FuncDatetimePrecListOpt ')'
	{
		$$ = &ast.FuncCallExpr{FnName: model.NewCIStr($1), Args: $3.([]ast.ExprNode)}
	}
|	FunctionNameDateArithMultiForms '(' Expression ',' Expression ')'
	{
		$$ = &ast.FuncCallExpr{
			FnName: model.NewCIStr($1),
			Args: []ast.ExprNode{
				$3,
				$5,
				&ast.TimeUnitExpr{Unit: ast.TimeUnitDay},
			},
		}
	}
|	FunctionNameDateArithMultiForms '(' Expression ',' "INTERVAL" Expression TimeUnit ')'
	{
		$$ = &ast.FuncCallExpr{
			FnName: model.NewCIStr($1),
			Args: []ast.ExprNode{
				$3,
				$6,
				&ast.TimeUnitExpr{Unit: $7.(ast.TimeUnitType)},
			},
		}
	}
|	FunctionNameDateArith '(' Expression ',' "INTERVAL" Expression TimeUnit ')'
	{
		$$ = &ast.FuncCallExpr{
			FnName: model.NewCIStr($1),
			Args: []ast.ExprNode{
				$3,
				$6,
				&ast.TimeUnitExpr{Unit: $7.(ast.TimeUnitType)},
			},
		}
	}
|	builtinExtract '(' TimeUnit "FROM" Expression ')'
	{
		timeUnit := &ast.TimeUnitExpr{Unit: $3.(ast.TimeUnitType)}
		$$ = &ast.FuncCallExpr{
			FnName: model.NewCIStr($1),
			Args:   []ast.ExprNode{timeUnit, $5},
		}
	}
|	"GET_FORMAT" '(' GetFormatSelector ',' Expression ')'
	{
		$$ = &ast.FuncCallExpr{
			FnName: model.NewCIStr($1),
			Args: []ast.ExprNode{
				&ast.GetFormatSelectorExpr{Selector: $3.(ast.GetFormatSelectorType)},
				$5,
			},
		}
	}
|	builtinPosition '(' BitExpr "IN" Expression ')'
	{
		$$ = &ast.FuncCallExpr{FnName: model.NewCIStr($1), Args: []ast.ExprNode{$3, $5}}
	}
|	builtinSubstring '(' Expression ',' Expression ')'
	{
		$$ = &ast.FuncCallExpr{
			FnName: model.NewCIStr($1),
			Args:   []ast.ExprNode{$3, $5},
		}
	}
|	builtinSubstring '(' Expression "FROM" Expression ')'
	{
		$$ = &ast.FuncCallExpr{
			FnName: model.NewCIStr($1),
			Args:   []ast.ExprNode{$3, $5},
		}
	}
|	builtinSubstring '(' Expression ',' Expression ',' Expression ')'
	{
		$$ = &ast.FuncCallExpr{
			FnName: model.NewCIStr($1),
			Args:   []ast.ExprNode{$3, $5, $7},
		}
	}
|	builtinSubstring '(' Expression "FROM" Expression "FOR" Expression ')'
	{
		$$ = &ast.FuncCallExpr{
			FnName: model.NewCIStr($1),
			Args:   []ast.ExprNode{$3, $5, $7},
		}
	}
|	"TIMESTAMPADD" '(' TimestampUnit ',' Expression ',' Expression ')'
	{
		$$ = &ast.FuncCallExpr{
			FnName: model.NewCIStr($1),
			Args:   []ast.ExprNode{&ast.TimeUnitExpr{Unit: $3.(ast.TimeUnitType)}, $5, $7},
		}
	}
|	"TIMESTAMPDIFF" '(' TimestampUnit ',' Expression ',' Expression ')'
	{
		$$ = &ast.FuncCallExpr{
			FnName: model.NewCIStr($1),
			Args:   []ast.ExprNode{&ast.TimeUnitExpr{Unit: $3.(ast.TimeUnitType)}, $5, $7},
		}
	}
|	builtinTrim '(' Expression ')'
	{
		$$ = &ast.FuncCallExpr{
			FnName: model.NewCIStr($1),
			Args:   []ast.ExprNode{$3},
		}
	}
|	builtinTrim '(' Expression "FROM" Expression ')'
	{
		$$ = &ast.FuncCallExpr{
			FnName: model.NewCIStr($1),
			Args:   []ast.ExprNode{$5, $3},
		}
	}
|	builtinTrim '(' TrimDirection "FROM" Expression ')'
	{
		nilVal := ast.NewValueExpr(nil, parser.charset, parser.collation)
		direction := &ast.TrimDirectionExpr{Direction: $3.(ast.TrimDirectionType)}
		$$ = &ast.FuncCallExpr{
			FnName: model.NewCIStr($1),
			Args:   []ast.ExprNode{$5, nilVal, direction},
		}
	}
|	builtinTrim '(' TrimDirection Expression "FROM" Expression ')'
	{
		direction := &ast.TrimDirectionExpr{Direction: $3.(ast.TrimDirectionType)}
		$$ = &ast.FuncCallExpr{
			FnName: model.NewCIStr($1),
			Args:   []ast.ExprNode{$6, $4, direction},
		}
	}
|	weightString '(' Expression ')'
	{
		$$ = &ast.FuncCallExpr{
			FnName: model.NewCIStr($1),
			Args:   []ast.ExprNode{$3},
		}
	}
|	weightString '(' Expression "AS" Char FieldLen ')'
	{
		$$ = &ast.FuncCallExpr{
			FnName: model.NewCIStr($1),
			Args:   []ast.ExprNode{$3, ast.NewValueExpr("CHAR", parser.charset, parser.collation), ast.NewValueExpr($6, parser.charset, parser.collation)},
		}
	}
|	weightString '(' Expression "AS" "BINARY" FieldLen ')'
	{
		$$ = &ast.FuncCallExpr{
			FnName: model.NewCIStr($1),
			Args:   []ast.ExprNode{$3, ast.NewValueExpr("BINARY", parser.charset, parser.collation), ast.NewValueExpr($6, parser.charset, parser.collation)},
		}
	}
|	FunctionNameSequence

GetFormatSelector:
	"DATE"
	{
		$$ = ast.GetFormatSelectorDate
	}
|	"DATETIME"
	{
		$$ = ast.GetFormatSelectorDatetime
	}
|	"TIME"
	{
		$$ = ast.GetFormatSelectorTime
	}
|	"TIMESTAMP"
	{
		$$ = ast.GetFormatSelectorDatetime
	}

FunctionNameDateArith:
	builtinDateAdd
|	builtinDateSub

FunctionNameDateArithMultiForms:
	builtinAddDate
|	builtinSubDate

TrimDirection:
	"BOTH"
	{
		$$ = ast.TrimBoth
	}
|	"LEADING"
	{
		$$ = ast.TrimLeading
	}
|	"TRAILING"
	{
		$$ = ast.TrimTrailing
	}

FunctionNameSequence:
	"LASTVAL" '(' TableName ')'
	{
		objNameExpr := &ast.TableNameExpr{
			Name: $3.(*ast.TableName),
		}
		$$ = &ast.FuncCallExpr{
			FnName: model.NewCIStr(ast.LastVal),
			Args:   []ast.ExprNode{objNameExpr},
		}
	}
|	"SETVAL" '(' TableName ',' SignedNum ')'
	{
		objNameExpr := &ast.TableNameExpr{
			Name: $3.(*ast.TableName),
		}
		valueExpr := ast.NewValueExpr($5, parser.charset, parser.collation)
		$$ = &ast.FuncCallExpr{
			FnName: model.NewCIStr(ast.SetVal),
			Args:   []ast.ExprNode{objNameExpr, valueExpr},
		}
	}
|	NextValueForSequence

SumExpr:
	"AVG" '(' BuggyDefaultFalseDistinctOpt Expression ')' OptWindowingClause
	{
		if $6 != nil {
			$$ = &ast.WindowFuncExpr{F: $1, Args: []ast.ExprNode{$4}, Distinct: $3.(bool), Spec: *($6.(*ast.WindowSpec))}
		} else {
			$$ = &ast.AggregateFuncExpr{F: $1, Args: []ast.ExprNode{$4}, Distinct: $3.(bool)}
		}
	}
|	builtinApproxCountDistinct '(' ExpressionList ')'
	{
		$$ = &ast.AggregateFuncExpr{F: $1, Args: $3.([]ast.ExprNode), Distinct: false}
	}
|	builtinApproxPercentile '(' ExpressionList ')'
	{
		$$ = &ast.AggregateFuncExpr{F: $1, Args: $3.([]ast.ExprNode)}
	}
|	builtinBitAnd '(' Expression ')' OptWindowingClause
	{
		if $5 != nil {
			$$ = &ast.WindowFuncExpr{F: $1, Args: []ast.ExprNode{$3}, Spec: *($5.(*ast.WindowSpec))}
		} else {
			$$ = &ast.AggregateFuncExpr{F: $1, Args: []ast.ExprNode{$3}}
		}
	}
|	builtinBitAnd '(' "ALL" Expression ')' OptWindowingClause
	{
		if $6 != nil {
			$$ = &ast.WindowFuncExpr{F: $1, Args: []ast.ExprNode{$4}, Spec: *($6.(*ast.WindowSpec))}
		} else {
			$$ = &ast.AggregateFuncExpr{F: $1, Args: []ast.ExprNode{$4}}
		}
	}
|	builtinBitOr '(' Expression ')' OptWindowingClause
	{
		if $5 != nil {
			$$ = &ast.WindowFuncExpr{F: $1, Args: []ast.ExprNode{$3}, Spec: *($5.(*ast.WindowSpec))}
		} else {
			$$ = &ast.AggregateFuncExpr{F: $1, Args: []ast.ExprNode{$3}}
		}
	}
|	builtinBitOr '(' "ALL" Expression ')' OptWindowingClause
	{
		if $6 != nil {
			$$ = &ast.WindowFuncExpr{F: $1, Args: []ast.ExprNode{$4}, Spec: *($6.(*ast.WindowSpec))}
		} else {
			$$ = &ast.AggregateFuncExpr{F: $1, Args: []ast.ExprNode{$4}}
		}
	}
|	builtinBitXor '(' Expression ')' OptWindowingClause
	{
		if $5 != nil {
			$$ = &ast.WindowFuncExpr{F: $1, Args: []ast.ExprNode{$3}, Spec: *($5.(*ast.WindowSpec))}
		} else {
			$$ = &ast.AggregateFuncExpr{F: $1, Args: []ast.ExprNode{$3}}
		}
	}
|	builtinBitXor '(' "ALL" Expression ')' OptWindowingClause
	{
		if $6 != nil {
			$$ = &ast.WindowFuncExpr{F: $1, Args: []ast.ExprNode{$4}, Spec: *($6.(*ast.WindowSpec))}
		} else {
			$$ = &ast.AggregateFuncExpr{F: $1, Args: []ast.ExprNode{$4}}
		}
	}
|	builtinCount '(' DistinctKwd ExpressionList ')'
	{
		$$ = &ast.AggregateFuncExpr{F: $1, Args: $4.([]ast.ExprNode), Distinct: true}
	}
|	builtinCount '(' "ALL" Expression ')' OptWindowingClause
	{
		if $6 != nil {
			$$ = &ast.WindowFuncExpr{F: $1, Args: []ast.ExprNode{$4}, Spec: *($6.(*ast.WindowSpec))}
		} else {
			$$ = &ast.AggregateFuncExpr{F: $1, Args: []ast.ExprNode{$4}}
		}
	}
|	builtinCount '(' Expression ')' OptWindowingClause
	{
		if $5 != nil {
			$$ = &ast.WindowFuncExpr{F: $1, Args: []ast.ExprNode{$3}, Spec: *($5.(*ast.WindowSpec))}
		} else {
			$$ = &ast.AggregateFuncExpr{F: $1, Args: []ast.ExprNode{$3}}
		}
	}
|	builtinCount '(' '*' ')' OptWindowingClause
	{
		args := []ast.ExprNode{ast.NewValueExpr(1, parser.charset, parser.collation)}
		if $5 != nil {
			$$ = &ast.WindowFuncExpr{F: $1, Args: args, Spec: *($5.(*ast.WindowSpec))}
		} else {
			$$ = &ast.AggregateFuncExpr{F: $1, Args: args}
		}
	}
|	builtinGroupConcat '(' BuggyDefaultFalseDistinctOpt ExpressionList OrderByOptional OptGConcatSeparator ')' OptWindowingClause
	{
		args := $4.([]ast.ExprNode)
		args = append(args, $6.(ast.ExprNode))
		if $8 != nil {
			$$ = &ast.WindowFuncExpr{F: $1, Args: args, Distinct: $3.(bool), Spec: *($8.(*ast.WindowSpec))}
		} else {
			agg := &ast.AggregateFuncExpr{F: $1, Args: args, Distinct: $3.(bool)}
			if $5 != nil {
				agg.Order = $5.(*ast.OrderByClause)
			}
			$$ = agg
		}
	}
|	builtinMax '(' BuggyDefaultFalseDistinctOpt Expression ')' OptWindowingClause
	{
		if $6 != nil {
			$$ = &ast.WindowFuncExpr{F: $1, Args: []ast.ExprNode{$4}, Distinct: $3.(bool), Spec: *($6.(*ast.WindowSpec))}
		} else {
			$$ = &ast.AggregateFuncExpr{F: $1, Args: []ast.ExprNode{$4}, Distinct: $3.(bool)}
		}
	}
|	builtinMin '(' BuggyDefaultFalseDistinctOpt Expression ')' OptWindowingClause
	{
		if $6 != nil {
			$$ = &ast.WindowFuncExpr{F: $1, Args: []ast.ExprNode{$4}, Distinct: $3.(bool), Spec: *($6.(*ast.WindowSpec))}
		} else {
			$$ = &ast.AggregateFuncExpr{F: $1, Args: []ast.ExprNode{$4}, Distinct: $3.(bool)}
		}
	}
|	builtinSum '(' BuggyDefaultFalseDistinctOpt Expression ')' OptWindowingClause
	{
		if $6 != nil {
			$$ = &ast.WindowFuncExpr{F: $1, Args: []ast.ExprNode{$4}, Distinct: $3.(bool), Spec: *($6.(*ast.WindowSpec))}
		} else {
			$$ = &ast.AggregateFuncExpr{F: $1, Args: []ast.ExprNode{$4}, Distinct: $3.(bool)}
		}
	}
|	builtinStddevPop '(' BuggyDefaultFalseDistinctOpt Expression ')' OptWindowingClause
	{
		if $6 != nil {
			$$ = &ast.WindowFuncExpr{F: ast.AggFuncStddevPop, Args: []ast.ExprNode{$4}, Distinct: $3.(bool), Spec: *($6.(*ast.WindowSpec))}
		} else {
			$$ = &ast.AggregateFuncExpr{F: ast.AggFuncStddevPop, Args: []ast.ExprNode{$4}, Distinct: $3.(bool)}
		}
	}
|	builtinStddevSamp '(' BuggyDefaultFalseDistinctOpt Expression ')' OptWindowingClause
	{
		if $6 != nil {
			$$ = &ast.WindowFuncExpr{F: $1, Args: []ast.ExprNode{$4}, Distinct: $3.(bool), Spec: *($6.(*ast.WindowSpec))}
		} else {
			$$ = &ast.AggregateFuncExpr{F: $1, Args: []ast.ExprNode{$4}, Distinct: $3.(bool)}
		}
	}
|	builtinVarPop '(' BuggyDefaultFalseDistinctOpt Expression ')' OptWindowingClause
	{
		if $6 != nil {
			$$ = &ast.WindowFuncExpr{F: ast.AggFuncVarPop, Args: []ast.ExprNode{$4}, Distinct: $3.(bool), Spec: *($6.(*ast.WindowSpec))}
		} else {
			$$ = &ast.AggregateFuncExpr{F: ast.AggFuncVarPop, Args: []ast.ExprNode{$4}, Distinct: $3.(bool)}
		}
	}
|	builtinVarSamp '(' BuggyDefaultFalseDistinctOpt Expression ')' OptWindowingClause
	{
		$$ = &ast.AggregateFuncExpr{F: $1, Args: []ast.ExprNode{$4}, Distinct: $3.(bool)}
	}
|	"JSON_ARRAYAGG" '(' Expression ')' OptWindowingClause
	{
		if $5 != nil {
			$$ = &ast.WindowFuncExpr{F: $1, Args: []ast.ExprNode{$3}, Spec: *($5.(*ast.WindowSpec))}
		} else {
			$$ = &ast.AggregateFuncExpr{F: $1, Args: []ast.ExprNode{$3}}
		}
	}
|	"JSON_ARRAYAGG" '(' "ALL" Expression ')' OptWindowingClause
	{
		if $6 != nil {
			$$ = &ast.WindowFuncExpr{F: $1, Args: []ast.ExprNode{$4}, Spec: *($6.(*ast.WindowSpec))}
		} else {
			$$ = &ast.AggregateFuncExpr{F: $1, Args: []ast.ExprNode{$4}}
		}
	}
|	"JSON_OBJECTAGG" '(' Expression ',' Expression ')' OptWindowingClause
	{
		if $7 != nil {
			$$ = &ast.WindowFuncExpr{F: $1, Args: []ast.ExprNode{$3, $5}, Spec: *($7.(*ast.WindowSpec))}
		} else {
			$$ = &ast.AggregateFuncExpr{F: $1, Args: []ast.ExprNode{$3, $5}}
		}
	}
|	"JSON_OBJECTAGG" '(' "ALL" Expression ',' Expression ')' OptWindowingClause
	{
		if $8 != nil {
			$$ = &ast.WindowFuncExpr{F: $1, Args: []ast.ExprNode{$4, $6}, Spec: *($8.(*ast.WindowSpec))}
		} else {
			$$ = &ast.AggregateFuncExpr{F: $1, Args: []ast.ExprNode{$4, $6}}
		}
	}
|	"JSON_OBJECTAGG" '(' Expression ',' "ALL" Expression ')' OptWindowingClause
	{
		if $8 != nil {
			$$ = &ast.WindowFuncExpr{F: $1, Args: []ast.ExprNode{$3, $6}, Spec: *($8.(*ast.WindowSpec))}
		} else {
			$$ = &ast.AggregateFuncExpr{F: $1, Args: []ast.ExprNode{$3, $6}}
		}
	}
|	"JSON_OBJECTAGG" '(' "ALL" Expression ',' "ALL" Expression ')' OptWindowingClause
	{
		if $9 != nil {
			$$ = &ast.WindowFuncExpr{F: $1, Args: []ast.ExprNode{$4, $7}, Spec: *($9.(*ast.WindowSpec))}
		} else {
			$$ = &ast.AggregateFuncExpr{F: $1, Args: []ast.ExprNode{$4, $7}}
		}
	}

OptGConcatSeparator:
	{
		$$ = ast.NewValueExpr(",", "", "")
	}
|	"SEPARATOR" stringLit
	{
		$$ = ast.NewValueExpr($2, "", "")
	}

FunctionCallGeneric:
	identifier '(' ExpressionListOpt ')'
	{
		$$ = &ast.FuncCallExpr{
			FnName: model.NewCIStr($1),
			Args:   $3.([]ast.ExprNode),
		}
	}
|	Identifier '.' Identifier '(' ExpressionListOpt ')'
	{
		var tp ast.FuncCallExprType
		if isInTokenMap($3) {
			tp = ast.FuncCallExprTypeKeyword
		} else {
			tp = ast.FuncCallExprTypeGeneric
		}
		$$ = &ast.FuncCallExpr{
			Tp:     tp,
			Schema: model.NewCIStr($1),
			FnName: model.NewCIStr($3),
			Args:   $5.([]ast.ExprNode),
		}
	}

FuncDatetimePrec:
	{
		$$ = nil
	}
|	'(' ')'
	{
		$$ = nil
	}
|	'(' intLit ')'
	{
		expr := ast.NewValueExpr($2, parser.charset, parser.collation)
		$$ = expr
	}

TimeUnit:
	TimestampUnit
|	"SECOND_MICROSECOND"
	{
		$$ = ast.TimeUnitSecondMicrosecond
	}
|	"MINUTE_MICROSECOND"
	{
		$$ = ast.TimeUnitMinuteMicrosecond
	}
|	"MINUTE_SECOND"
	{
		$$ = ast.TimeUnitMinuteSecond
	}
|	"HOUR_MICROSECOND"
	{
		$$ = ast.TimeUnitHourMicrosecond
	}
|	"HOUR_SECOND"
	{
		$$ = ast.TimeUnitHourSecond
	}
|	"HOUR_MINUTE"
	{
		$$ = ast.TimeUnitHourMinute
	}
|	"DAY_MICROSECOND"
	{
		$$ = ast.TimeUnitDayMicrosecond
	}
|	"DAY_SECOND"
	{
		$$ = ast.TimeUnitDaySecond
	}
|	"DAY_MINUTE"
	{
		$$ = ast.TimeUnitDayMinute
	}
|	"DAY_HOUR"
	{
		$$ = ast.TimeUnitDayHour
	}
|	"YEAR_MONTH"
	{
		$$ = ast.TimeUnitYearMonth
	}

TimestampUnit:
	"MICROSECOND"
	{
		$$ = ast.TimeUnitMicrosecond
	}
|	"SECOND"
	{
		$$ = ast.TimeUnitSecond
	}
|	"MINUTE"
	{
		$$ = ast.TimeUnitMinute
	}
|	"HOUR"
	{
		$$ = ast.TimeUnitHour
	}
|	"DAY"
	{
		$$ = ast.TimeUnitDay
	}
|	"WEEK"
	{
		$$ = ast.TimeUnitWeek
	}
|	"MONTH"
	{
		$$ = ast.TimeUnitMonth
	}
|	"QUARTER"
	{
		$$ = ast.TimeUnitQuarter
	}
|	"YEAR"
	{
		$$ = ast.TimeUnitYear
	}
|	"SQL_TSI_SECOND"
	{
		$$ = ast.TimeUnitSecond
	}
|	"SQL_TSI_MINUTE"
	{
		$$ = ast.TimeUnitMinute
	}
|	"SQL_TSI_HOUR"
	{
		$$ = ast.TimeUnitHour
	}
|	"SQL_TSI_DAY"
	{
		$$ = ast.TimeUnitDay
	}
|	"SQL_TSI_WEEK"
	{
		$$ = ast.TimeUnitWeek
	}
|	"SQL_TSI_MONTH"
	{
		$$ = ast.TimeUnitMonth
	}
|	"SQL_TSI_QUARTER"
	{
		$$ = ast.TimeUnitQuarter
	}
|	"SQL_TSI_YEAR"
	{
		$$ = ast.TimeUnitYear
	}

ExpressionOpt:
	{
		$$ = nil
	}
|	Expression

WhenClauseList:
	WhenClause
	{
		$$ = []*ast.WhenClause{$1.(*ast.WhenClause)}
	}
|	WhenClauseList WhenClause
	{
		$$ = append($1.([]*ast.WhenClause), $2.(*ast.WhenClause))
	}

WhenClause:
	"WHEN" Expression "THEN" Expression
	{
		$$ = &ast.WhenClause{
			Expr:   $2,
			Result: $4,
		}
	}

ElseOpt:
	/* empty */
	{
		$$ = nil
	}
|	"ELSE" Expression
	{
		$$ = $2
	}

CastType:
	"BINARY" OptFieldLen
	{
		x := types.NewFieldType(mysql.TypeVarString)
		x.Flen = $2.(int) // TODO: Flen should be the flen of expression
		if x.Flen != types.UnspecifiedLength {
			x.Tp = mysql.TypeString
		}
		x.Charset = charset.CharsetBin
		x.Collate = charset.CollationBin
		x.Flag |= mysql.BinaryFlag
		$$ = x
	}
|	Char OptFieldLen OptBinary
	{
		x := types.NewFieldType(mysql.TypeVarString)
		x.Flen = $2.(int) // TODO: Flen should be the flen of expression
		x.Charset = $3.(*ast.OptBinary).Charset
		if $3.(*ast.OptBinary).IsBinary {
			x.Flag |= mysql.BinaryFlag
			x.Charset = charset.CharsetBin
			x.Collate = charset.CollationBin
		} else if x.Charset != "" {
			co, err := charset.GetDefaultCollation(x.Charset)
			if err != nil {
				yylex.AppendError(yylex.Errorf("Get collation error for charset: %s", x.Charset))
				return 1
			}
			x.Collate = co
			parser.explicitCharset = true
		} else {
			x.Charset = parser.charset
			x.Collate = parser.collation
		}
		$$ = x
	}
|	"DATE"
	{
		x := types.NewFieldType(mysql.TypeDate)
		x.Charset = charset.CharsetBin
		x.Collate = charset.CollationBin
		x.Flag |= mysql.BinaryFlag
		$$ = x
	}
|	"DATETIME" OptFieldLen
	{
		x := types.NewFieldType(mysql.TypeDatetime)
		x.Flen, _ = mysql.GetDefaultFieldLengthAndDecimalForCast(mysql.TypeDatetime)
		x.Decimal = $2.(int)
		if x.Decimal > 0 {
			x.Flen = x.Flen + 1 + x.Decimal
		}
		x.Charset = charset.CharsetBin
		x.Collate = charset.CollationBin
		x.Flag |= mysql.BinaryFlag
		$$ = x
	}
|	"DECIMAL" FloatOpt
	{
		fopt := $2.(*ast.FloatOpt)
		x := types.NewFieldType(mysql.TypeNewDecimal)
		x.Flen = fopt.Flen
		x.Decimal = fopt.Decimal
		x.Charset = charset.CharsetBin
		x.Collate = charset.CollationBin
		x.Flag |= mysql.BinaryFlag
		$$ = x
	}
|	"TIME" OptFieldLen
	{
		x := types.NewFieldType(mysql.TypeDuration)
		x.Flen, _ = mysql.GetDefaultFieldLengthAndDecimalForCast(mysql.TypeDuration)
		x.Decimal = $2.(int)
		if x.Decimal > 0 {
			x.Flen = x.Flen + 1 + x.Decimal
		}
		x.Charset = charset.CharsetBin
		x.Collate = charset.CollationBin
		x.Flag |= mysql.BinaryFlag
		$$ = x
	}
|	"SIGNED" OptInteger
	{
		x := types.NewFieldType(mysql.TypeLonglong)
		x.Charset = charset.CharsetBin
		x.Collate = charset.CollationBin
		x.Flag |= mysql.BinaryFlag
		$$ = x
	}
|	"UNSIGNED" OptInteger
	{
		x := types.NewFieldType(mysql.TypeLonglong)
		x.Flag |= mysql.UnsignedFlag | mysql.BinaryFlag
		x.Charset = charset.CharsetBin
		x.Collate = charset.CollationBin
		$$ = x
	}
|	"JSON"
	{
		x := types.NewFieldType(mysql.TypeJSON)
		x.Flag |= mysql.BinaryFlag | (mysql.ParseToJSONFlag)
		x.Charset = mysql.DefaultCharset
		x.Collate = mysql.DefaultCollationName
		$$ = x
	}
|	"DOUBLE"
	{
		x := types.NewFieldType(mysql.TypeDouble)
		x.Flen, x.Decimal = mysql.GetDefaultFieldLengthAndDecimalForCast(mysql.TypeDouble)
		x.Flag |= mysql.BinaryFlag
		x.Charset = charset.CharsetBin
		x.Collate = charset.CollationBin
		$$ = x
	}
|	"FLOAT" FloatOpt
	{
		x := types.NewFieldType(mysql.TypeFloat)
		fopt := $2.(*ast.FloatOpt)
		if fopt.Flen >= 54 {
			yylex.AppendError(ErrTooBigPrecision.GenWithStackByArgs(fopt.Flen, "CAST", 53))
		} else if fopt.Flen >= 25 {
			x = types.NewFieldType(mysql.TypeDouble)
		}
		x.Flen, x.Decimal = mysql.GetDefaultFieldLengthAndDecimalForCast(x.Tp)
		x.Flag |= mysql.BinaryFlag
		x.Charset = charset.CharsetBin
		x.Collate = charset.CollationBin
		$$ = x
	}
|	"REAL"
	{
		var x *types.FieldType
		if parser.lexer.GetSQLMode().HasRealAsFloatMode() {
			x = types.NewFieldType(mysql.TypeFloat)
		} else {
			x = types.NewFieldType(mysql.TypeDouble)
		}
		x.Flen, x.Decimal = mysql.GetDefaultFieldLengthAndDecimalForCast(x.Tp)
		x.Flag |= mysql.BinaryFlag
		x.Charset = charset.CharsetBin
		x.Collate = charset.CollationBin
		$$ = x
	}

Priority:
	"LOW_PRIORITY"
	{
		$$ = mysql.LowPriority
	}
|	"HIGH_PRIORITY"
	{
		$$ = mysql.HighPriority
	}
|	"DELAYED"
	{
		$$ = mysql.DelayedPriority
	}

PriorityOpt:
	{
		$$ = mysql.NoPriority
	}
|	Priority

TableName:
	Identifier
	{
		$$ = &ast.TableName{Name: model.NewCIStr($1)}
	}
|	Identifier '.' Identifier
	{
		$$ = &ast.TableName{Schema: model.NewCIStr($1), Name: model.NewCIStr($3)}
	}

TableNameList:
	TableName
	{
		tbl := []*ast.TableName{$1.(*ast.TableName)}
		$$ = tbl
	}
|	TableNameList ',' TableName
	{
		$$ = append($1.([]*ast.TableName), $3.(*ast.TableName))
	}

TableNameOptWild:
	Identifier OptWild
	{
		$$ = &ast.TableName{Name: model.NewCIStr($1)}
	}
|	Identifier '.' Identifier OptWild
	{
		$$ = &ast.TableName{Schema: model.NewCIStr($1), Name: model.NewCIStr($3)}
	}

TableAliasRefList:
	TableNameOptWild
	{
		tbl := []*ast.TableName{$1.(*ast.TableName)}
		$$ = tbl
	}
|	TableAliasRefList ',' TableNameOptWild
	{
		$$ = append($1.([]*ast.TableName), $3.(*ast.TableName))
	}

OptWild:
	%prec empty
	{}
|	'.' '*'
	{}

QuickOptional:
	%prec empty
	{
		$$ = false
	}
|	"QUICK"
	{
		$$ = true
	}

/***************************Prepared Statement Start******************************
 * See https://dev.mysql.com/doc/refman/5.7/en/prepare.html
 * Example:
 * PREPARE stmt_name FROM 'SELECT SQRT(POW(?,2) + POW(?,2)) AS hypotenuse';
 * OR
 * SET @s = 'SELECT SQRT(POW(?,2) + POW(?,2)) AS hypotenuse';
 * PREPARE stmt_name FROM @s;
 */
PreparedStmt:
	"PREPARE" Identifier "FROM" PrepareSQL
	{
		var sqlText string
		var sqlVar *ast.VariableExpr
		switch x := $4.(type) {
		case string:
			sqlText = x
		case *ast.VariableExpr:
			sqlVar = x
		}
		$$ = &ast.PrepareStmt{
			Name:    $2,
			SQLText: sqlText,
			SQLVar:  sqlVar,
		}
	}

PrepareSQL:
	stringLit
	{
		$$ = $1
	}
|	UserVariable
	{
		$$ = $1
	}

/*
 * See https://dev.mysql.com/doc/refman/5.7/en/execute.html
 * Example:
 * EXECUTE stmt1 USING @a, @b;
 * OR
 * EXECUTE stmt1;
 */
ExecuteStmt:
	"EXECUTE" Identifier
	{
		$$ = &ast.ExecuteStmt{Name: $2}
	}
|	"EXECUTE" Identifier "USING" UserVariableList
	{
		$$ = &ast.ExecuteStmt{
			Name:      $2,
			UsingVars: $4.([]ast.ExprNode),
		}
	}

UserVariableList:
	UserVariable
	{
		$$ = []ast.ExprNode{$1}
	}
|	UserVariableList ',' UserVariable
	{
		$$ = append($1.([]ast.ExprNode), $3)
	}

DeallocateStmt:
	DeallocateSym "PREPARE" Identifier
	{
		$$ = &ast.DeallocateStmt{Name: $3}
	}

DeallocateSym:
	"DEALLOCATE"
|	"DROP"

RollbackStmt:
	"ROLLBACK"
	{
		$$ = &ast.RollbackStmt{}
	}
|	"ROLLBACK" CompletionTypeWithinTransaction
	{
		$$ = &ast.RollbackStmt{CompletionType: $2.(ast.CompletionType)}
	}

CompletionTypeWithinTransaction:
	"AND" "CHAIN" "NO" "RELEASE"
	{
		$$ = ast.CompletionTypeChain
	}
|	"AND" "NO" "CHAIN" "RELEASE"
	{
		$$ = ast.CompletionTypeRelease
	}
|	"AND" "NO" "CHAIN" "NO" "RELEASE"
	{
		$$ = ast.CompletionTypeDefault
	}
|	"AND" "CHAIN"
	{
		$$ = ast.CompletionTypeChain
	}
|	"AND" "NO" "CHAIN"
	{
		$$ = ast.CompletionTypeDefault
	}
|	"RELEASE"
	{
		$$ = ast.CompletionTypeRelease
	}
|	"NO" "RELEASE"
	{
		$$ = ast.CompletionTypeDefault
	}

ShutdownStmt:
	"SHUTDOWN"
	{
		$$ = &ast.ShutdownStmt{}
	}

SelectStmtBasic:
	"SELECT" SelectStmtOpts SelectStmtFieldList
	{
		st := &ast.SelectStmt{
			SelectStmtOpts: $2.(*ast.SelectStmtOpts),
			Distinct:       $2.(*ast.SelectStmtOpts).Distinct,
			Fields:         $3.(*ast.FieldList),
			Kind:           ast.SelectStmtKindSelect,
		}
		if st.SelectStmtOpts.TableHints != nil {
			st.TableHints = st.SelectStmtOpts.TableHints
		}
		$$ = st
	}

SelectStmtFromDualTable:
	SelectStmtBasic FromDual WhereClauseOptional
	{
		st := $1.(*ast.SelectStmt)
		lastField := st.Fields.Fields[len(st.Fields.Fields)-1]
		if lastField.Expr != nil && lastField.AsName.O == "" {
			lastEnd := yyS[yypt-1].offset - 1
			lastField.SetText(parser.src[lastField.Offset:lastEnd])
		}
		if $3 != nil {
			st.Where = $3.(ast.ExprNode)
		}
	}

SelectStmtFromTable:
	SelectStmtBasic "FROM" TableRefsClause WhereClauseOptional TraverseOptional SelectStmtGroup HavingClause WindowClauseOptional
	{
		st := $1.(*ast.SelectStmt)
		st.From = $3.(*ast.TableRefsClause)
		lastField := st.Fields.Fields[len(st.Fields.Fields)-1]
		if lastField.Expr != nil && lastField.AsName.O == "" {
			lastEnd := parser.endOffset(&yyS[yypt-6])
			lastField.SetText(parser.src[lastField.Offset:lastEnd])
		}
		if $4 != nil {
			st.Where = $4.(ast.ExprNode)
		}
		if $5 != nil {
			st.Traverse = $5.(*ast.TraverseChain)
		}
		if $6 != nil {
			st.GroupBy = $6.(*ast.GroupByClause)
		}
		if $7 != nil {
			st.Having = $7.(*ast.HavingClause)
		}
		if $8 != nil {
			st.WindowSpecs = ($8.([]ast.WindowSpec))
		}
		$$ = st
	}

TableSampleOpt:
	%prec empty
	{
		$$ = nil
	}
|	"TABLESAMPLE" TableSampleMethodOpt '(' Expression TableSampleUnitOpt ')' RepeatableOpt
	{
		var repSeed ast.ExprNode
		if $7 != nil {
			repSeed = ast.NewValueExpr($7, parser.charset, parser.collation)
		}
		$$ = &ast.TableSample{
			SampleMethod:     $2.(ast.SampleMethodType),
			Expr:             ast.NewValueExpr($4, parser.charset, parser.collation),
			SampleClauseUnit: $5.(ast.SampleClauseUnitType),
			RepeatableSeed:   repSeed,
		}
	}
|	"TABLESAMPLE" TableSampleMethodOpt '(' ')' RepeatableOpt
	{
		var repSeed ast.ExprNode
		if $5 != nil {
			repSeed = ast.NewValueExpr($5, parser.charset, parser.collation)
		}
		$$ = &ast.TableSample{
			SampleMethod:   $2.(ast.SampleMethodType),
			RepeatableSeed: repSeed,
		}
	}

TableSampleMethodOpt:
	%prec empty
	{
		$$ = ast.SampleMethodTypeNone
	}
|	"SYSTEM"
	{
		$$ = ast.SampleMethodTypeSystem
	}
|	"BERNOULLI"
	{
		$$ = ast.SampleMethodTypeBernoulli
	}
|	"REGIONS"
	{
		$$ = ast.SampleMethodTypeTiDBRegion
	}

TableSampleUnitOpt:
	%prec empty
	{
		$$ = ast.SampleClauseUnitTypeDefault
	}
|	"ROWS"
	{
		$$ = ast.SampleClauseUnitTypeRow
	}
|	"PERCENT"
	{
		$$ = ast.SampleClauseUnitTypePercent
	}

RepeatableOpt:
	%prec empty
	{
		$$ = nil
	}
|	"REPEATABLE" '(' Expression ')'
	{
		$$ = $3
	}

SelectStmt:
	SelectStmtBasic WhereClauseOptional OrderByOptional SelectStmtLimitOpt SelectLockOpt SelectStmtIntoOption
	{
		st := $1.(*ast.SelectStmt)
		if $5 != nil {
			st.LockInfo = $5.(*ast.SelectLockInfo)
		}
		lastField := st.Fields.Fields[len(st.Fields.Fields)-1]
		if lastField.Expr != nil && lastField.AsName.O == "" {
			src := parser.src
			var lastEnd int
			if $2 != nil {
				lastEnd = yyS[yypt-4].offset - 1
			} else if $3 != nil {
				lastEnd = yyS[yypt-3].offset - 1
			} else if $4 != nil {
				lastEnd = yyS[yypt-2].offset - 1
			} else if st.LockInfo != nil && st.LockInfo.LockType != ast.SelectLockNone {
				lastEnd = yyS[yypt-1].offset - 1
			} else if $6 != nil {
				lastEnd = yyS[yypt].offset - 1
			} else {
				lastEnd = len(src)
				if src[lastEnd-1] == ';' {
					lastEnd--
				}
			}
			lastField.SetText(src[lastField.Offset:lastEnd])
		}
		if $2 != nil {
			st.Where = $2.(ast.ExprNode)
		}
		if $3 != nil {
			st.OrderBy = $3.(*ast.OrderByClause)
		}
		if $4 != nil {
			st.Limit = $4.(*ast.Limit)
		}
		if $6 != nil {
			st.SelectIntoOpt = $6.(*ast.SelectIntoOption)
		}
		$$ = st
	}
|	SelectStmtFromDualTable OrderByOptional SelectStmtLimitOpt SelectLockOpt SelectStmtIntoOption
	{
		st := $1.(*ast.SelectStmt)
		if $2 != nil {
			st.OrderBy = $2.(*ast.OrderByClause)
		}
		if $3 != nil {
			st.Limit = $3.(*ast.Limit)
		}
		if $4 != nil {
			st.LockInfo = $4.(*ast.SelectLockInfo)
		}
		if $5 != nil {
			st.SelectIntoOpt = $5.(*ast.SelectIntoOption)
		}
		$$ = st
	}
|	SelectStmtFromTable OrderByOptional SelectStmtLimitOpt SelectLockOpt SelectStmtIntoOption
	{
		st := $1.(*ast.SelectStmt)
		if $4 != nil {
			st.LockInfo = $4.(*ast.SelectLockInfo)
		}
		if $2 != nil {
			st.OrderBy = $2.(*ast.OrderByClause)
		}
		if $3 != nil {
			st.Limit = $3.(*ast.Limit)
		}
		if $5 != nil {
			st.SelectIntoOpt = $5.(*ast.SelectIntoOption)
		}
		$$ = st
	}
|	"TABLE" TableName OrderByOptional SelectStmtLimitOpt SelectLockOpt SelectStmtIntoOption
	{
		st := &ast.SelectStmt{
			Kind:   ast.SelectStmtKindTable,
			Fields: &ast.FieldList{Fields: []*ast.SelectField{{WildCard: &ast.WildCardField{}}}},
		}
		ts := &ast.TableSource{Source: $2.(*ast.TableName)}
		st.From = &ast.TableRefsClause{TableRefs: &ast.Join{Left: ts}}
		if $3 != nil {
			st.OrderBy = $3.(*ast.OrderByClause)
		}
		if $4 != nil {
			st.Limit = $4.(*ast.Limit)
		}
		if $5 != nil {
			st.LockInfo = $5.(*ast.SelectLockInfo)
		}
		if $6 != nil {
			st.SelectIntoOpt = $6.(*ast.SelectIntoOption)
		}
		$$ = st
	}
|	"VALUES" ValuesStmtList OrderByOptional SelectStmtLimitOpt SelectLockOpt SelectStmtIntoOption
	{
		st := &ast.SelectStmt{
			Kind:   ast.SelectStmtKindValues,
			Fields: &ast.FieldList{Fields: []*ast.SelectField{{WildCard: &ast.WildCardField{}}}},
			Lists:  $2.([]*ast.RowExpr),
		}
		if $3 != nil {
			st.OrderBy = $3.(*ast.OrderByClause)
		}
		if $4 != nil {
			st.Limit = $4.(*ast.Limit)
		}
		if $5 != nil {
			st.LockInfo = $5.(*ast.SelectLockInfo)
		}
		if $6 != nil {
			st.SelectIntoOpt = $6.(*ast.SelectIntoOption)
		}
		$$ = st
	}

FromDual:
	"FROM" "DUAL"

WindowClauseOptional:
	{
		$$ = nil
	}
|	"WINDOW" WindowDefinitionList
	{
		$$ = $2.([]ast.WindowSpec)
	}

WindowDefinitionList:
	WindowDefinition
	{
		$$ = []ast.WindowSpec{$1.(ast.WindowSpec)}
	}
|	WindowDefinitionList ',' WindowDefinition
	{
		$$ = append($1.([]ast.WindowSpec), $3.(ast.WindowSpec))
	}

WindowDefinition:
	WindowName "AS" WindowSpec
	{
		var spec = $3.(ast.WindowSpec)
		spec.Name = $1.(model.CIStr)
		$$ = spec
	}

WindowName:
	Identifier
	{
		$$ = model.NewCIStr($1)
	}

WindowSpec:
	'(' WindowSpecDetails ')'
	{
		$$ = $2.(ast.WindowSpec)
	}

WindowSpecDetails:
	OptExistingWindowName OptPartitionClause OptWindowOrderByClause OptWindowFrameClause
	{
		spec := ast.WindowSpec{Ref: $1.(model.CIStr)}
		if $2 != nil {
			spec.PartitionBy = $2.(*ast.PartitionByClause)
		}
		if $3 != nil {
			spec.OrderBy = $3.(*ast.OrderByClause)
		}
		if $4 != nil {
			spec.Frame = $4.(*ast.FrameClause)
		}
		$$ = spec
	}

OptExistingWindowName:
	{
		$$ = model.CIStr{}
	}
|	WindowName

OptPartitionClause:
	{
		$$ = nil
	}
|	"PARTITION" "BY" ByList
	{
		$$ = &ast.PartitionByClause{Items: $3.([]*ast.ByItem)}
	}

OptWindowOrderByClause:
	{
		$$ = nil
	}
|	"ORDER" "BY" ByList
	{
		$$ = &ast.OrderByClause{Items: $3.([]*ast.ByItem)}
	}

OptWindowFrameClause:
	{
		$$ = nil
	}
|	WindowFrameUnits WindowFrameExtent
	{
		$$ = &ast.FrameClause{
			Type:   $1.(ast.FrameType),
			Extent: $2.(ast.FrameExtent),
		}
	}

WindowFrameUnits:
	"ROWS"
	{
		$$ = ast.FrameType(ast.Rows)
	}
|	"RANGE"
	{
		$$ = ast.FrameType(ast.Ranges)
	}
|	"GROUPS"
	{
		$$ = ast.FrameType(ast.Groups)
	}

WindowFrameExtent:
	WindowFrameStart
	{
		$$ = ast.FrameExtent{
			Start: $1.(ast.FrameBound),
			End:   ast.FrameBound{Type: ast.CurrentRow},
		}
	}
|	WindowFrameBetween

WindowFrameStart:
	"UNBOUNDED" "PRECEDING"
	{
		$$ = ast.FrameBound{Type: ast.Preceding, UnBounded: true}
	}
|	NumLiteral "PRECEDING"
	{
		$$ = ast.FrameBound{Type: ast.Preceding, Expr: ast.NewValueExpr($1, parser.charset, parser.collation)}
	}
|	paramMarker "PRECEDING"
	{
		$$ = ast.FrameBound{Type: ast.Preceding, Expr: ast.NewParamMarkerExpr(yyS[yypt].offset)}
	}
|	"INTERVAL" Expression TimeUnit "PRECEDING"
	{
		$$ = ast.FrameBound{Type: ast.Preceding, Expr: $2, Unit: $3.(ast.TimeUnitType)}
	}
|	"CURRENT" "ROW"
	{
		$$ = ast.FrameBound{Type: ast.CurrentRow}
	}

WindowFrameBetween:
	"BETWEEN" WindowFrameBound "AND" WindowFrameBound
	{
		$$ = ast.FrameExtent{Start: $2.(ast.FrameBound), End: $4.(ast.FrameBound)}
	}

WindowFrameBound:
	WindowFrameStart
|	"UNBOUNDED" "FOLLOWING"
	{
		$$ = ast.FrameBound{Type: ast.Following, UnBounded: true}
	}
|	NumLiteral "FOLLOWING"
	{
		$$ = ast.FrameBound{Type: ast.Following, Expr: ast.NewValueExpr($1, parser.charset, parser.collation)}
	}
|	paramMarker "FOLLOWING"
	{
		$$ = ast.FrameBound{Type: ast.Following, Expr: ast.NewParamMarkerExpr(yyS[yypt].offset)}
	}
|	"INTERVAL" Expression TimeUnit "FOLLOWING"
	{
		$$ = ast.FrameBound{Type: ast.Following, Expr: $2, Unit: $3.(ast.TimeUnitType)}
	}

OptWindowingClause:
	{
		$$ = nil
	}
|	WindowingClause
	{
		spec := $1.(ast.WindowSpec)
		$$ = &spec
	}

WindowingClause:
	"OVER" WindowNameOrSpec
	{
		$$ = $2.(ast.WindowSpec)
	}

WindowNameOrSpec:
	WindowName
	{
		$$ = ast.WindowSpec{Name: $1.(model.CIStr), OnlyAlias: true}
	}
|	WindowSpec

WindowFuncCall:
	"ROW_NUMBER" '(' ')' WindowingClause
	{
		$$ = &ast.WindowFuncExpr{F: $1, Spec: $4.(ast.WindowSpec)}
	}
|	"RANK" '(' ')' WindowingClause
	{
		$$ = &ast.WindowFuncExpr{F: $1, Spec: $4.(ast.WindowSpec)}
	}
|	"DENSE_RANK" '(' ')' WindowingClause
	{
		$$ = &ast.WindowFuncExpr{F: $1, Spec: $4.(ast.WindowSpec)}
	}
|	"CUME_DIST" '(' ')' WindowingClause
	{
		$$ = &ast.WindowFuncExpr{F: $1, Spec: $4.(ast.WindowSpec)}
	}
|	"PERCENT_RANK" '(' ')' WindowingClause
	{
		$$ = &ast.WindowFuncExpr{F: $1, Spec: $4.(ast.WindowSpec)}
	}
|	"NTILE" '(' SimpleExpr ')' WindowingClause
	{
		$$ = &ast.WindowFuncExpr{F: $1, Args: []ast.ExprNode{$3}, Spec: $5.(ast.WindowSpec)}
	}
|	"LEAD" '(' Expression OptLeadLagInfo ')' OptNullTreatment WindowingClause
	{
		args := []ast.ExprNode{$3}
		if $4 != nil {
			args = append(args, $4.([]ast.ExprNode)...)
		}
		$$ = &ast.WindowFuncExpr{F: $1, Args: args, IgnoreNull: $6.(bool), Spec: $7.(ast.WindowSpec)}
	}
|	"LAG" '(' Expression OptLeadLagInfo ')' OptNullTreatment WindowingClause
	{
		args := []ast.ExprNode{$3}
		if $4 != nil {
			args = append(args, $4.([]ast.ExprNode)...)
		}
		$$ = &ast.WindowFuncExpr{F: $1, Args: args, IgnoreNull: $6.(bool), Spec: $7.(ast.WindowSpec)}
	}
|	"FIRST_VALUE" '(' Expression ')' OptNullTreatment WindowingClause
	{
		$$ = &ast.WindowFuncExpr{F: $1, Args: []ast.ExprNode{$3}, IgnoreNull: $5.(bool), Spec: $6.(ast.WindowSpec)}
	}
|	"LAST_VALUE" '(' Expression ')' OptNullTreatment WindowingClause
	{
		$$ = &ast.WindowFuncExpr{F: $1, Args: []ast.ExprNode{$3}, IgnoreNull: $5.(bool), Spec: $6.(ast.WindowSpec)}
	}
|	"NTH_VALUE" '(' Expression ',' SimpleExpr ')' OptFromFirstLast OptNullTreatment WindowingClause
	{
		$$ = &ast.WindowFuncExpr{F: $1, Args: []ast.ExprNode{$3, $5}, FromLast: $7.(bool), IgnoreNull: $8.(bool), Spec: $9.(ast.WindowSpec)}
	}

OptLeadLagInfo:
	{
		$$ = nil
	}
|	',' NumLiteral OptLLDefault
	{
		args := []ast.ExprNode{ast.NewValueExpr($2, parser.charset, parser.collation)}
		if $3 != nil {
			args = append(args, $3.(ast.ExprNode))
		}
		$$ = args
	}
|	',' paramMarker OptLLDefault
	{
		args := []ast.ExprNode{ast.NewValueExpr($2, parser.charset, parser.collation)}
		if $3 != nil {
			args = append(args, $3.(ast.ExprNode))
		}
		$$ = args
	}

OptLLDefault:
	{
		$$ = nil
	}
|	',' Expression
	{
		$$ = $2
	}

OptNullTreatment:
	{
		$$ = false
	}
|	"RESPECT" "NULLS"
	{
		$$ = false
	}
|	"IGNORE" "NULLS"
	{
		$$ = true
	}

OptFromFirstLast:
	{
		$$ = false
	}
|	"FROM" "FIRST"
	{
		$$ = false
	}
|	"FROM" "LAST"
	{
		$$ = true
	}

TableRefsClause:
	TableRefs
	{
		$$ = &ast.TableRefsClause{TableRefs: $1.(*ast.Join)}
	}

TableRefs:
	EscapedTableRef
	{
		if j, ok := $1.(*ast.Join); ok {
			// if $1 is Join, use it directly
			$$ = j
		} else {
			$$ = &ast.Join{Left: $1.(ast.ResultSetNode), Right: nil}
		}
	}
|	TableRefs ',' EscapedTableRef
	{
		/* from a, b is default cross join */
		$$ = &ast.Join{Left: $1.(ast.ResultSetNode), Right: $3.(ast.ResultSetNode), Tp: ast.CrossJoin}
	}

EscapedTableRef:
	TableRef %prec lowerThanSetKeyword
|	'{' Identifier TableRef '}'
	{
		/*
		 * ODBC escape syntax for outer join is { OJ join_table }
		 * Use an Identifier for OJ
		 */
		$$ = $3
	}

TableRef:
	TableFactor
|	JoinTable

TableFactor:
	TableName PartitionNameListOpt TableAsNameOpt IndexHintListOpt TableSampleOpt
	{
		tn := $1.(*ast.TableName)
		tn.PartitionNames = $2.([]model.CIStr)
		tn.IndexHints = $4.([]*ast.IndexHint)
		if $5 != nil {
			tn.TableSample = $5.(*ast.TableSample)
		}
		$$ = &ast.TableSource{Source: tn, AsName: $3.(model.CIStr)}
	}
|	'(' SetOprStmt1 ')' TableAsNameOpt
	{
		if st, isSel := $2.(*ast.SelectStmt); isSel {
			endOffset := parser.endOffset(&yyS[yypt-1])
			parser.setLastSelectFieldText(st, endOffset)
		}
		$$ = &ast.TableSource{Source: $2.(ast.ResultSetNode), AsName: $4.(model.CIStr)}
	}
|	'(' TableRefs ')'
	{
		j := $2.(*ast.Join)
		j.ExplicitParens = true
		$$ = $2
	}

PartitionNameListOpt:
	/* empty */
	{
		$$ = []model.CIStr{}
	}
|	"PARTITION" '(' PartitionNameList ')'
	{
		$$ = $3
	}

TableAsNameOpt:
	{
		$$ = model.CIStr{}
	}
|	TableAsName

TableAsName:
	Identifier
	{
		$$ = model.NewCIStr($1)
	}
|	"AS" Identifier
	{
		$$ = model.NewCIStr($2)
	}

IndexHintType:
	"USE" KeyOrIndex
	{
		$$ = ast.HintUse
	}
|	"IGNORE" KeyOrIndex
	{
		$$ = ast.HintIgnore
	}
|	"FORCE" KeyOrIndex
	{
		$$ = ast.HintForce
	}

IndexHintScope:
	{
		$$ = ast.HintForScan
	}
|	"FOR" "JOIN"
	{
		$$ = ast.HintForJoin
	}
|	"FOR" "ORDER" "BY"
	{
		$$ = ast.HintForOrderBy
	}
|	"FOR" "GROUP" "BY"
	{
		$$ = ast.HintForGroupBy
	}

IndexHint:
	IndexHintType IndexHintScope '(' IndexNameList ')'
	{
		$$ = &ast.IndexHint{
			IndexNames: $4.([]model.CIStr),
			HintType:   $1.(ast.IndexHintType),
			HintScope:  $2.(ast.IndexHintScope),
		}
	}

IndexNameList:
	{
		var nameList []model.CIStr
		$$ = nameList
	}
|	Identifier
	{
		$$ = []model.CIStr{model.NewCIStr($1)}
	}
|	IndexNameList ',' Identifier
	{
		$$ = append($1.([]model.CIStr), model.NewCIStr($3))
	}
|	"PRIMARY"
	{
		$$ = []model.CIStr{model.NewCIStr($1)}
	}
|	IndexNameList ',' "PRIMARY"
	{
		$$ = append($1.([]model.CIStr), model.NewCIStr($3))
	}

IndexHintList:
	IndexHint
	{
		$$ = []*ast.IndexHint{$1.(*ast.IndexHint)}
	}
|	IndexHintList IndexHint
	{
		$$ = append($1.([]*ast.IndexHint), $2.(*ast.IndexHint))
	}

IndexHintListOpt:
	{
		$$ = []*ast.IndexHint{}
	}
|	IndexHintList

JoinTable:
	/* Use %prec to evaluate production TableRef before cross join */
	TableRef CrossOpt TableRef %prec tableRefPriority
	{
		$$ = ast.NewCrossJoin($1.(ast.ResultSetNode), $3.(ast.ResultSetNode))
	}
|	TableRef CrossOpt TableRef "ON" Expression
	{
		on := &ast.OnCondition{Expr: $5}
		$$ = &ast.Join{Left: $1.(ast.ResultSetNode), Right: $3.(ast.ResultSetNode), Tp: ast.CrossJoin, On: on}
	}
|	TableRef CrossOpt TableRef "USING" '(' ColumnNameList ')'
	{
		$$ = &ast.Join{Left: $1.(ast.ResultSetNode), Right: $3.(ast.ResultSetNode), Tp: ast.CrossJoin, Using: $6.([]*ast.ColumnName)}
	}
|	TableRef JoinType OuterOpt "JOIN" TableRef "ON" Expression
	{
		on := &ast.OnCondition{Expr: $7}
		$$ = &ast.Join{Left: $1.(ast.ResultSetNode), Right: $5.(ast.ResultSetNode), Tp: $2.(ast.JoinType), On: on}
	}
|	TableRef JoinType OuterOpt "JOIN" TableRef "USING" '(' ColumnNameList ')'
	{
		$$ = &ast.Join{Left: $1.(ast.ResultSetNode), Right: $5.(ast.ResultSetNode), Tp: $2.(ast.JoinType), Using: $8.([]*ast.ColumnName)}
	}
|	TableRef "NATURAL" "JOIN" TableRef
	{
		$$ = &ast.Join{Left: $1.(ast.ResultSetNode), Right: $4.(ast.ResultSetNode), NaturalJoin: true}
	}
|	TableRef "NATURAL" JoinType OuterOpt "JOIN" TableRef
	{
		$$ = &ast.Join{Left: $1.(ast.ResultSetNode), Right: $6.(ast.ResultSetNode), Tp: $3.(ast.JoinType), NaturalJoin: true}
	}
|	TableRef "STRAIGHT_JOIN" TableRef
	{
		$$ = &ast.Join{Left: $1.(ast.ResultSetNode), Right: $3.(ast.ResultSetNode), StraightJoin: true}
	}
|	TableRef "STRAIGHT_JOIN" TableRef "ON" Expression
	{
		on := &ast.OnCondition{Expr: $5}
		$$ = &ast.Join{Left: $1.(ast.ResultSetNode), Right: $3.(ast.ResultSetNode), StraightJoin: true, On: on}
	}

JoinType:
	"LEFT"
	{
		$$ = ast.LeftJoin
	}
|	"RIGHT"
	{
		$$ = ast.RightJoin
	}

OuterOpt:
	{}
|	"OUTER"

CrossOpt:
	"JOIN"
|	"CROSS" "JOIN"
|	"INNER" "JOIN"

LimitClause:
	{
		$$ = nil
	}
|	"LIMIT" LimitOption
	{
		$$ = &ast.Limit{Count: $2.(ast.ValueExpr)}
	}

LimitOption:
	LengthNum
	{
		$$ = ast.NewValueExpr($1, parser.charset, parser.collation)
	}
|	paramMarker
	{
		$$ = ast.NewParamMarkerExpr(yyS[yypt].offset)
	}

RowOrRows:
	"ROW"
|	"ROWS"

FirstOrNext:
	"FIRST"
|	"NEXT"

FetchFirstOpt:
	{
		$$ = ast.NewValueExpr(uint64(1), parser.charset, parser.collation)
	}
|	LimitOption

SelectStmtLimit:
	"LIMIT" LimitOption
	{
		$$ = &ast.Limit{Count: $2.(ast.ExprNode)}
	}
|	"LIMIT" LimitOption ',' LimitOption
	{
		$$ = &ast.Limit{Offset: $2.(ast.ExprNode), Count: $4.(ast.ExprNode)}
	}
|	"LIMIT" LimitOption "OFFSET" LimitOption
	{
		$$ = &ast.Limit{Offset: $4.(ast.ExprNode), Count: $2.(ast.ExprNode)}
	}
|	"FETCH" FirstOrNext FetchFirstOpt RowOrRows "ONLY"
	{
		$$ = &ast.Limit{Count: $3.(ast.ExprNode)}
	}

SelectStmtLimitOpt:
	{
		$$ = nil
	}
|	SelectStmtLimit

SelectStmtOpt:
	TableOptimizerHints
	{
		opt := &ast.SelectStmtOpts{}
		opt.SQLCache = true
		opt.TableHints = $1.([]*ast.TableOptimizerHint)
		$$ = opt
	}
|	DistinctOpt
	{
		opt := &ast.SelectStmtOpts{}
		opt.SQLCache = true
		if $1.(bool) {
			opt.Distinct = true
		} else {
			opt.Distinct = false
			opt.ExplicitAll = true
		}
		$$ = opt
	}
|	Priority
	{
		opt := &ast.SelectStmtOpts{}
		opt.SQLCache = true
		opt.Priority = $1.(mysql.PriorityEnum)
		$$ = opt
	}
|	"SQL_SMALL_RESULT"
	{
		opt := &ast.SelectStmtOpts{}
		opt.SQLCache = true
		opt.SQLSmallResult = true
		$$ = opt
	}
|	"SQL_BIG_RESULT"
	{
		opt := &ast.SelectStmtOpts{}
		opt.SQLCache = true
		opt.SQLBigResult = true
		$$ = opt
	}
|	"SQL_BUFFER_RESULT"
	{
		opt := &ast.SelectStmtOpts{}
		opt.SQLCache = true
		opt.SQLBufferResult = true
		$$ = opt
	}
|	SelectStmtSQLCache
	{
		opt := &ast.SelectStmtOpts{}
		opt.SQLCache = $1.(bool)
		$$ = opt
	}
|	"SQL_CALC_FOUND_ROWS"
	{
		opt := &ast.SelectStmtOpts{}
		opt.SQLCache = true
		opt.CalcFoundRows = true
		$$ = opt
	}
|	"STRAIGHT_JOIN"
	{
		opt := &ast.SelectStmtOpts{}
		opt.SQLCache = true
		opt.StraightJoin = true
		$$ = opt
	}

SelectStmtOpts:
	%prec empty
	{
		opt := &ast.SelectStmtOpts{}
		opt.SQLCache = true
		$$ = opt
	}
|	SelectStmtOptsList %prec lowerThanSelectOpt

SelectStmtOptsList:
	SelectStmtOptsList SelectStmtOpt
	{
		opts := $1.(*ast.SelectStmtOpts)
		opt := $2.(*ast.SelectStmtOpts)

		// Merge options.
		// Always use the first hint.
		if opt.TableHints != nil && opts.TableHints == nil {
			opts.TableHints = opt.TableHints
		}
		if opt.Distinct {
			opts.Distinct = true
		}
		if opt.Priority != mysql.NoPriority {
			opts.Priority = opt.Priority
		}
		if opt.SQLSmallResult {
			opts.SQLSmallResult = true
		}
		if opt.SQLBigResult {
			opts.SQLBigResult = true
		}
		if opt.SQLBufferResult {
			opts.SQLBufferResult = true
		}
		if !opt.SQLCache {
			opts.SQLCache = false
		}
		if opt.CalcFoundRows {
			opts.CalcFoundRows = true
		}
		if opt.StraightJoin {
			opts.StraightJoin = true
		}
		if opt.ExplicitAll {
			opts.ExplicitAll = true
		}

		if opts.Distinct && opts.ExplicitAll {
			yylex.AppendError(ErrWrongUsage.GenWithStackByArgs("ALL", "DISTINCT"))
			return 1
		}

		$$ = opts
	}
|	SelectStmtOpt

TableOptimizerHints:
	hintComment
	{
		hints, warns := parser.parseHint($1)
		for _, w := range warns {
			yylex.AppendError(w)
			parser.lastErrorAsWarn()
		}
		$$ = hints
	}

TableOptimizerHintsOpt:
	/* empty */
	{
		$$ = nil
	}
|	TableOptimizerHints

SelectStmtSQLCache:
	"SQL_CACHE"
	{
		$$ = true
	}
|	"SQL_NO_CACHE"
	{
		$$ = false
	}

SelectStmtFieldList:
	FieldList
	{
		$$ = &ast.FieldList{Fields: $1.([]*ast.SelectField)}
	}

SelectStmtGroup:
	/* EMPTY */
	{
		$$ = nil
	}
|	GroupByClause

SelectStmtIntoOption:
	{
		$$ = nil
	}
|	"INTO" "OUTFILE" stringLit Fields Lines
	{
		x := &ast.SelectIntoOption{
			Tp:       ast.SelectIntoOutfile,
			FileName: $3,
		}
		if $4 != nil {
			x.FieldsInfo = $4.(*ast.FieldsClause)
		}
		if $5 != nil {
			x.LinesInfo = $5.(*ast.LinesClause)
		}

		$$ = x
	}

// See https://dev.mysql.com/doc/refman/5.7/en/subqueries.html
SubSelect:
	'(' SetOprStmt1 ')'
	{
		if s, isSel := $2.(*ast.SelectStmt); isSel {
			endOffset := parser.endOffset(&yyS[yypt])
			parser.setLastSelectFieldText(s, endOffset)
		}
		rs := $2.(ast.ResultSetNode)
		src := parser.src
		// See the implementation of yyParse function
		rs.SetText(src[yyS[yypt-1].offset:yyS[yypt].offset])
		$$ = &ast.SubqueryExpr{Query: rs}
	}

SubSelect2:
	'(' SetOprStmt2 ')'
	{
		if s, isSel := $2.(*ast.SelectStmt); isSel {
			endOffset := parser.endOffset(&yyS[yypt])
			parser.setLastSelectFieldText(s, endOffset)
		}
		rs := $2.(ast.ResultSetNode)
		src := parser.src
		// See the implementation of yyParse function
		rs.SetText(src[yyS[yypt-1].offset:yyS[yypt].offset])
		$$ = &ast.SubqueryExpr{Query: rs}
	}

// See https://dev.mysql.com/doc/refman/8.0/en/innodb-locking-reads.html
SelectLockOpt:
	/* empty */
	{
		$$ = nil
	}
|	"FOR" "UPDATE"
	{
		$$ = &ast.SelectLockInfo{LockType: ast.SelectLockForUpdate}
	}
|	"FOR" "SHARE"
	{
		$$ = &ast.SelectLockInfo{LockType: ast.SelectLockForShare}
	}
|	"FOR" "UPDATE" "NOWAIT"
	{
		$$ = &ast.SelectLockInfo{LockType: ast.SelectLockForUpdateNoWait}
	}
|	"FOR" "UPDATE" "WAIT" NUM
	{
		$$ = &ast.SelectLockInfo{
			LockType: ast.SelectLockForUpdateWaitN,
			WaitSec:  getUint64FromNUM($4),
		}
	}
|	"FOR" "SHARE" "NOWAIT"
	{
		$$ = &ast.SelectLockInfo{LockType: ast.SelectLockForShareNoWait}
	}
|	"FOR" "UPDATE" "SKIP" "LOCKED"
	{
		$$ = &ast.SelectLockInfo{LockType: ast.SelectLockForUpdateSkipLocked}
	}
|	"FOR" "SHARE" "SKIP" "LOCKED"
	{
		$$ = &ast.SelectLockInfo{LockType: ast.SelectLockForShareSkipLocked}
	}
|	"LOCK" "IN" "SHARE" "MODE"
	{
		$$ = &ast.SelectLockInfo{LockType: ast.SelectLockForShare}
	}

SetOprStmt1:
	SetOprClauseList %prec lowerThanParenthese
	{
		setOpr := &ast.SetOprStmt{SelectList: &ast.SetOprSelectList{Selects: $1.([]ast.Node)}}
		lastSelect := setOpr.SelectList.Selects[len(setOpr.SelectList.Selects)-1]
		if sel, isSelect := lastSelect.(*ast.SelectStmt); isSelect && len(setOpr.SelectList.Selects) == 1 {
			$$ = sel
		} else {
			if sel, isSelect := lastSelect.(*ast.SelectStmt); isSelect && !sel.IsInBraces {
				setOpr.OrderBy = sel.OrderBy
				setOpr.Limit = sel.Limit
				sel.OrderBy = nil
				sel.Limit = nil
			}
			$$ = setOpr
		}
	}
|	SetOprStmt

SetOprStmt2:
	SetOprClauseList %prec higherThanParenthese
	{
		setOpr := &ast.SetOprStmt{SelectList: &ast.SetOprSelectList{Selects: $1.([]ast.Node)}}
		lastSelect := setOpr.SelectList.Selects[len(setOpr.SelectList.Selects)-1]
		if sel, isSelect := lastSelect.(*ast.SelectStmt); isSelect && len(setOpr.SelectList.Selects) == 1 {
			$$ = sel
		} else {
			if sel, isSelect := lastSelect.(*ast.SelectStmt); isSelect && !sel.IsInBraces {
				setOpr.OrderBy = sel.OrderBy
				setOpr.Limit = sel.Limit
				sel.OrderBy = nil
				sel.Limit = nil
			}
			$$ = setOpr
		}
	}
|	SetOprStmt

// See https://dev.mysql.com/doc/refman/5.7/en/union.html
// See https://mariadb.com/kb/en/intersect/
// See https://mariadb.com/kb/en/except/
SetOprStmt:
	SetOprClauseList SetOpr '(' SetOprClauseList ')' OrderBy
	{
		setOprList1 := $1.([]ast.Node)
		setOprList2 := $4.([]ast.Node)
		if sel, isSelect := setOprList1[len(setOprList1)-1].(*ast.SelectStmt); isSelect && !sel.IsInBraces {
			endOffset := parser.endOffset(&yyS[yypt-4])
			parser.setLastSelectFieldText(sel, endOffset)
		}
		nextSetOprList := &ast.SetOprSelectList{Selects: setOprList2}
		nextSetOprList.AfterSetOperator = $2.(*ast.SetOprType)
		setOprList := append(setOprList1, nextSetOprList)
		setOpr := &ast.SetOprStmt{SelectList: &ast.SetOprSelectList{Selects: setOprList}}
		setOpr.OrderBy = $6.(*ast.OrderByClause)
		$$ = setOpr
	}
|	SetOprClauseList SetOpr '(' SetOprClauseList ')' SelectStmtLimit
	{
		setOprList1 := $1.([]ast.Node)
		setOprList2 := $4.([]ast.Node)
		if sel, isSelect := setOprList1[len(setOprList1)-1].(*ast.SelectStmt); isSelect && !sel.IsInBraces {
			endOffset := parser.endOffset(&yyS[yypt-4])
			parser.setLastSelectFieldText(sel, endOffset)
		}
		nextSetOprList := &ast.SetOprSelectList{Selects: setOprList2}
		nextSetOprList.AfterSetOperator = $2.(*ast.SetOprType)
		setOprList := append(setOprList1, nextSetOprList)
		setOpr := &ast.SetOprStmt{SelectList: &ast.SetOprSelectList{Selects: setOprList}}
		setOpr.Limit = $6.(*ast.Limit)
		$$ = setOpr
	}
|	SetOprClauseList SetOpr '(' SetOprClauseList ')' OrderBy SelectStmtLimit
	{
		setOprList1 := $1.([]ast.Node)
		setOprList2 := $4.([]ast.Node)
		if sel, isSelect := setOprList1[len(setOprList1)-1].(*ast.SelectStmt); isSelect && !sel.IsInBraces {
			endOffset := parser.endOffset(&yyS[yypt-5])
			parser.setLastSelectFieldText(sel, endOffset)
		}
		nextSetOprList := &ast.SetOprSelectList{Selects: setOprList2}
		nextSetOprList.AfterSetOperator = $2.(*ast.SetOprType)
		setOprList := append(setOprList1, nextSetOprList)
		setOpr := &ast.SetOprStmt{SelectList: &ast.SetOprSelectList{Selects: setOprList}}
		setOpr.OrderBy = $6.(*ast.OrderByClause)
		setOpr.Limit = $7.(*ast.Limit)
		$$ = setOpr
	}
|	'(' SetOprClauseList ')' OrderBy
	{
		setOprList := $2.([]ast.Node)
		if sel, isSelect := setOprList[0].(*ast.SelectStmt); isSelect && !sel.IsInBraces && len(setOprList) == 1 {
			endOffset := parser.endOffset(&yyS[yypt-1])
			parser.setLastSelectFieldText(sel, endOffset)
		}
		setOpr := &ast.SetOprStmt{SelectList: &ast.SetOprSelectList{Selects: []ast.Node{&ast.SetOprSelectList{Selects: $2.([]ast.Node)}}}}
		setOpr.OrderBy = $4.(*ast.OrderByClause)
		$$ = setOpr
	}
|	'(' SetOprClauseList ')' SelectStmtLimit
	{
		setOprList := $2.([]ast.Node)
		if sel, isSelect := setOprList[0].(*ast.SelectStmt); isSelect && !sel.IsInBraces && len(setOprList) == 1 {
			endOffset := parser.endOffset(&yyS[yypt-1])
			parser.setLastSelectFieldText(sel, endOffset)
		}
		setOpr := &ast.SetOprStmt{SelectList: &ast.SetOprSelectList{Selects: []ast.Node{&ast.SetOprSelectList{Selects: setOprList}}}}
		setOpr.Limit = $4.(*ast.Limit)
		$$ = setOpr
	}
|	'(' SetOprClauseList ')' OrderBy SelectStmtLimit
	{
		setOprList := $2.([]ast.Node)
		if sel, isSelect := setOprList[0].(*ast.SelectStmt); isSelect && !sel.IsInBraces && len(setOprList) == 1 {
			endOffset := parser.endOffset(&yyS[yypt-2])
			parser.setLastSelectFieldText(sel, endOffset)
		}
		setOpr := &ast.SetOprStmt{SelectList: &ast.SetOprSelectList{Selects: []ast.Node{&ast.SetOprSelectList{Selects: setOprList}}}}
		setOpr.OrderBy = $4.(*ast.OrderByClause)
		setOpr.Limit = $5.(*ast.Limit)
		$$ = setOpr
	}

SetOprClauseList:
	SetOprClause
|	SetOprClauseList SetOpr SetOprClause
	{
		setOprList1 := $1.([]ast.Node)
		setOprList2 := $3.([]ast.Node)
		if sel, isSelect := setOprList1[len(setOprList1)-1].(*ast.SelectStmt); isSelect && !sel.IsInBraces {
			endOffset := parser.endOffset(&yyS[yypt-1])
			parser.setLastSelectFieldText(sel, endOffset)
		}
		switch x := setOprList2[0].(type) {
		case *ast.SelectStmt:
			x.AfterSetOperator = $2.(*ast.SetOprType)
		case *ast.SetOprSelectList:
			x.AfterSetOperator = $2.(*ast.SetOprType)
		}
		$$ = append(setOprList1, setOprList2...)
	}

SetOprClause:
	SelectStmt
	{
		$$ = []ast.Node{$1.(*ast.SelectStmt)}
	}
|	'(' SetOprClauseList ')'
	{
		setList := $2.([]ast.Node)
		if sel, isSelect := setList[0].(*ast.SelectStmt); isSelect && len(setList) == 1 {
			endOffset := parser.endOffset(&yyS[yypt])
			parser.setLastSelectFieldText(sel, endOffset)
			sel.IsInBraces = true
		} else {
			setList = []ast.Node{&ast.SetOprSelectList{Selects: $2.([]ast.Node)}}
		}
		$$ = setList
	}

SetOpr:
	"UNION" SetOprOpt
	{
		var tp ast.SetOprType
		tp = ast.Union
		if $2 == false {
			tp = ast.UnionAll
		}
		$$ = &tp
	}
|	"EXCEPT" SetOprOpt
	{
		var tp ast.SetOprType
		tp = ast.Except
		if $2 == false {
			tp = ast.ExceptAll
		}
		$$ = &tp
	}
|	"INTERSECT" SetOprOpt
	{
		var tp ast.SetOprType
		tp = ast.Intersect
		if $2 == false {
			tp = ast.IntersectAll
		}
		$$ = &tp
	}

SetOprOpt:
	DefaultTrueDistinctOpt

/********************Change Statement*******************************/
ChangeStmt:
	"CHANGE" "PUMP" "TO" "NODE_STATE" eq stringLit forKwd "NODE_ID" stringLit
	{
		$$ = &ast.ChangeStmt{
			NodeType: ast.PumpType,
			State:    $6,
			NodeID:   $9,
		}
	}
|	"CHANGE" "DRAINER" "TO" "NODE_STATE" eq stringLit forKwd "NODE_ID" stringLit
	{
		$$ = &ast.ChangeStmt{
			NodeType: ast.DrainerType,
			State:    $6,
			NodeID:   $9,
		}
	}

/********************Set Statement*******************************/
SetStmt:
	"SET" VariableAssignmentList
	{
		$$ = &ast.SetStmt{Variables: $2.([]*ast.VariableAssignment)}
	}
|	"SET" "PASSWORD" eq PasswordOpt
	{
		$$ = &ast.SetPwdStmt{Password: $4}
	}
|	"SET" "PASSWORD" "FOR" Username eq PasswordOpt
	{
		$$ = &ast.SetPwdStmt{User: $4.(*auth.UserIdentity), Password: $6}
	}
|	"SET" "GLOBAL" "TRANSACTION" TransactionChars
	{
		vars := $4.([]*ast.VariableAssignment)
		for _, v := range vars {
			v.IsGlobal = true
		}
		$$ = &ast.SetStmt{Variables: vars}
	}
|	"SET" "SESSION" "TRANSACTION" TransactionChars
	{
		$$ = &ast.SetStmt{Variables: $4.([]*ast.VariableAssignment)}
	}
|	"SET" "TRANSACTION" TransactionChars
	{
		assigns := $3.([]*ast.VariableAssignment)
		for i := 0; i < len(assigns); i++ {
			if assigns[i].Name == "tx_isolation" {
				// A special session variable that make setting tx_isolation take effect one time.
				assigns[i].Name = "tx_isolation_one_shot"
			}
		}
		$$ = &ast.SetStmt{Variables: assigns}
	}
|	"SET" "CONFIG" Identifier ConfigItemName EqOrAssignmentEq SetExpr
	{
		$$ = &ast.SetConfigStmt{Type: strings.ToLower($3), Name: $4, Value: $6}
	}
|	"SET" "CONFIG" stringLit ConfigItemName EqOrAssignmentEq SetExpr
	{
		$$ = &ast.SetConfigStmt{Instance: $3, Name: $4, Value: $6}
	}

SetRoleStmt:
	"SET" "ROLE" SetRoleOpt
	{
		$$ = $3.(*ast.SetRoleStmt)
	}

SetDefaultRoleStmt:
	"SET" "DEFAULT" "ROLE" SetDefaultRoleOpt "TO" UsernameList
	{
		tmp := $4.(*ast.SetRoleStmt)
		$$ = &ast.SetDefaultRoleStmt{
			SetRoleOpt: tmp.SetRoleOpt,
			RoleList:   tmp.RoleList,
			UserList:   $6.([]*auth.UserIdentity),
		}
	}

SetDefaultRoleOpt:
	"NONE"
	{
		$$ = &ast.SetRoleStmt{SetRoleOpt: ast.SetRoleNone, RoleList: nil}
	}
|	"ALL"
	{
		$$ = &ast.SetRoleStmt{SetRoleOpt: ast.SetRoleAll, RoleList: nil}
	}
|	RolenameList
	{
		$$ = &ast.SetRoleStmt{SetRoleOpt: ast.SetRoleRegular, RoleList: $1.([]*auth.RoleIdentity)}
	}

SetRoleOpt:
	"ALL" "EXCEPT" RolenameList
	{
		$$ = &ast.SetRoleStmt{SetRoleOpt: ast.SetRoleAllExcept, RoleList: $3.([]*auth.RoleIdentity)}
	}
|	SetDefaultRoleOpt
|	"DEFAULT"
	{
		$$ = &ast.SetRoleStmt{SetRoleOpt: ast.SetRoleDefault, RoleList: nil}
	}

TransactionChars:
	TransactionChar
	{
		if $1 != nil {
			$$ = $1
		} else {
			$$ = []*ast.VariableAssignment{}
		}
	}
|	TransactionChars ',' TransactionChar
	{
		if $3 != nil {
			varAssigns := $3.([]*ast.VariableAssignment)
			$$ = append($1.([]*ast.VariableAssignment), varAssigns...)
		} else {
			$$ = $1
		}
	}

TransactionChar:
	"ISOLATION" "LEVEL" IsolationLevel
	{
		varAssigns := []*ast.VariableAssignment{}
		expr := ast.NewValueExpr($3, parser.charset, parser.collation)
		varAssigns = append(varAssigns, &ast.VariableAssignment{Name: "tx_isolation", Value: expr, IsSystem: true})
		$$ = varAssigns
	}
|	"READ" "WRITE"
	{
		varAssigns := []*ast.VariableAssignment{}
		expr := ast.NewValueExpr("0", parser.charset, parser.collation)
		varAssigns = append(varAssigns, &ast.VariableAssignment{Name: "tx_read_only", Value: expr, IsSystem: true})
		$$ = varAssigns
	}
|	"READ" "ONLY"
	{
		varAssigns := []*ast.VariableAssignment{}
		expr := ast.NewValueExpr("1", parser.charset, parser.collation)
		varAssigns = append(varAssigns, &ast.VariableAssignment{Name: "tx_read_only", Value: expr, IsSystem: true})
		$$ = varAssigns
	}

IsolationLevel:
	"REPEATABLE" "READ"
	{
		$$ = ast.RepeatableRead
	}
|	"READ" "COMMITTED"
	{
		$$ = ast.ReadCommitted
	}
|	"READ" "UNCOMMITTED"
	{
		$$ = ast.ReadUncommitted
	}
|	"SERIALIZABLE"
	{
		$$ = ast.Serializable
	}

SetExpr:
	"ON"
	{
		$$ = ast.NewValueExpr("ON", parser.charset, parser.collation)
	}
|	ExprOrDefault

EqOrAssignmentEq:
	eq
|	assignmentEq

VariableName:
	Identifier
|	Identifier '.' Identifier
	{
		$$ = $1 + "." + $3
	}

ConfigItemName:
	Identifier
|	Identifier '.' ConfigItemName
	{
		$$ = $1 + "." + $3
	}
|	Identifier '-' ConfigItemName
	{
		$$ = $1 + "-" + $3
	}

VariableAssignment:
	VariableName EqOrAssignmentEq SetExpr
	{
		$$ = &ast.VariableAssignment{Name: $1, Value: $3, IsSystem: true}
	}
|	"GLOBAL" VariableName EqOrAssignmentEq SetExpr
	{
		$$ = &ast.VariableAssignment{Name: $2, Value: $4, IsGlobal: true, IsSystem: true}
	}
|	"SESSION" VariableName EqOrAssignmentEq SetExpr
	{
		$$ = &ast.VariableAssignment{Name: $2, Value: $4, IsSystem: true}
	}
|	"LOCAL" VariableName EqOrAssignmentEq Expression
	{
		$$ = &ast.VariableAssignment{Name: $2, Value: $4, IsSystem: true}
	}
|	doubleAtIdentifier EqOrAssignmentEq SetExpr
	{
		v := strings.ToLower($1)
		var isGlobal bool
		if strings.HasPrefix(v, "@@global.") {
			isGlobal = true
			v = strings.TrimPrefix(v, "@@global.")
		} else if strings.HasPrefix(v, "@@session.") {
			v = strings.TrimPrefix(v, "@@session.")
		} else if strings.HasPrefix(v, "@@local.") {
			v = strings.TrimPrefix(v, "@@local.")
		} else if strings.HasPrefix(v, "@@") {
			v = strings.TrimPrefix(v, "@@")
		}
		$$ = &ast.VariableAssignment{Name: v, Value: $3, IsGlobal: isGlobal, IsSystem: true}
	}
|	singleAtIdentifier EqOrAssignmentEq Expression
	{
		v := $1
		v = strings.TrimPrefix(v, "@")
		$$ = &ast.VariableAssignment{Name: v, Value: $3}
	}
|	"NAMES" CharsetName
	{
		$$ = &ast.VariableAssignment{
			Name:  ast.SetNames,
			Value: ast.NewValueExpr($2, "", ""),
		}
	}
|	"NAMES" CharsetName "COLLATE" "DEFAULT"
	{
		$$ = &ast.VariableAssignment{
			Name:  ast.SetNames,
			Value: ast.NewValueExpr($2, "", ""),
		}
	}
|	"NAMES" CharsetName "COLLATE" StringName
	{
		$$ = &ast.VariableAssignment{
			Name:        ast.SetNames,
			Value:       ast.NewValueExpr($2, "", ""),
			ExtendValue: ast.NewValueExpr($4, "", ""),
		}
	}
|	"NAMES" "DEFAULT"
	{
		v := &ast.DefaultExpr{}
		$$ = &ast.VariableAssignment{Name: ast.SetNames, Value: v}
	}
|	CharsetKw CharsetNameOrDefault
	{
		$$ = &ast.VariableAssignment{Name: ast.SetCharset, Value: $2}
	}

CharsetNameOrDefault:
	CharsetName
	{
		$$ = ast.NewValueExpr($1, "", "")
	}
|	"DEFAULT"
	{
		$$ = &ast.DefaultExpr{}
	}

CharsetName:
	StringName
	{
		// Validate input charset name to keep the same behavior as parser of MySQL.
		name, _, err := charset.GetCharsetInfo($1)
		if err != nil {
			yylex.AppendError(ErrUnknownCharacterSet.GenWithStackByArgs($1))
			return 1
		}
		// Use charset name returned from charset.GetCharsetInfo(),
		// to keep lower case of input for generated column restore.
		$$ = name
	}
|	binaryType
	{
		$$ = charset.CharsetBin
	}

CollationName:
	StringName
	{
		info, err := charset.GetCollationByName($1)
		if err != nil {
			yylex.AppendError(err)
			return 1
		}
		$$ = info.Name
	}
|	binaryType
	{
		$$ = charset.CollationBin
	}

VariableAssignmentList:
	VariableAssignment
	{
		$$ = []*ast.VariableAssignment{$1.(*ast.VariableAssignment)}
	}
|	VariableAssignmentList ',' VariableAssignment
	{
		$$ = append($1.([]*ast.VariableAssignment), $3.(*ast.VariableAssignment))
	}

Variable:
	SystemVariable
|	UserVariable

SystemVariable:
	doubleAtIdentifier
	{
		v := strings.ToLower($1)
		var isGlobal bool
		explicitScope := true
		if strings.HasPrefix(v, "@@global.") {
			isGlobal = true
			v = strings.TrimPrefix(v, "@@global.")
		} else if strings.HasPrefix(v, "@@session.") {
			v = strings.TrimPrefix(v, "@@session.")
		} else if strings.HasPrefix(v, "@@local.") {
			v = strings.TrimPrefix(v, "@@local.")
		} else if strings.HasPrefix(v, "@@") {
			v, explicitScope = strings.TrimPrefix(v, "@@"), false
		}
		$$ = &ast.VariableExpr{Name: v, IsGlobal: isGlobal, IsSystem: true, ExplicitScope: explicitScope}
	}

UserVariable:
	singleAtIdentifier
	{
		v := $1
		v = strings.TrimPrefix(v, "@")
		$$ = &ast.VariableExpr{Name: v, IsGlobal: false, IsSystem: false}
	}

Username:
	StringName
	{
		$$ = &auth.UserIdentity{Username: $1, Hostname: "%"}
	}
|	StringName '@' StringName
	{
		$$ = &auth.UserIdentity{Username: $1, Hostname: $3}
	}
|	StringName singleAtIdentifier
	{
		$$ = &auth.UserIdentity{Username: $1, Hostname: strings.TrimPrefix($2, "@")}
	}
|	"CURRENT_USER" OptionalBraces
	{
		$$ = &auth.UserIdentity{CurrentUser: true}
	}

UsernameList:
	Username
	{
		$$ = []*auth.UserIdentity{$1.(*auth.UserIdentity)}
	}
|	UsernameList ',' Username
	{
		$$ = append($1.([]*auth.UserIdentity), $3.(*auth.UserIdentity))
	}

PasswordOpt:
	stringLit
|	"PASSWORD" '(' AuthString ')'
	{
		$$ = $3
	}

AuthString:
	stringLit

RoleNameString:
	stringLit
|	identifier

RolenameComposed:
	StringName '@' StringName
	{
		$$ = &auth.RoleIdentity{Username: $1, Hostname: $3}
	}
|	StringName singleAtIdentifier
	{
		$$ = &auth.RoleIdentity{Username: $1, Hostname: strings.TrimPrefix($2, "@")}
	}

RolenameWithoutIdent:
	stringLit
	{
		$$ = &auth.RoleIdentity{Username: $1, Hostname: "%"}
	}
|	RolenameComposed
	{
		$$ = $1
	}

Rolename:
	RoleNameString
	{
		$$ = &auth.RoleIdentity{Username: $1, Hostname: "%"}
	}
|	RolenameComposed
	{
		$$ = $1
	}

RolenameList:
	Rolename
	{
		$$ = []*auth.RoleIdentity{$1.(*auth.RoleIdentity)}
	}
|	RolenameList ',' Rolename
	{
		$$ = append($1.([]*auth.RoleIdentity), $3.(*auth.RoleIdentity))
	}

/****************************Admin Statement*******************************/
AdminStmt:
	"ADMIN" "SHOW" "DDL"
	{
		$$ = &ast.AdminStmt{Tp: ast.AdminShowDDL}
	}
|	"ADMIN" "SHOW" "DDL" "JOBS" WhereClauseOptional
	{
		stmt := &ast.AdminStmt{Tp: ast.AdminShowDDLJobs}
		if $5 != nil {
			stmt.Where = $5.(ast.ExprNode)
		}
		$$ = stmt
	}
|	"ADMIN" "SHOW" "DDL" "JOBS" Int64Num WhereClauseOptional
	{
		stmt := &ast.AdminStmt{
			Tp:        ast.AdminShowDDLJobs,
			JobNumber: $5.(int64),
		}
		if $6 != nil {
			stmt.Where = $6.(ast.ExprNode)
		}
		$$ = stmt
	}
|	"ADMIN" "SHOW" TableName "NEXT_ROW_ID"
	{
		$$ = &ast.AdminStmt{
			Tp:     ast.AdminShowNextRowID,
			Tables: []*ast.TableName{$3.(*ast.TableName)},
		}
	}
|	"ADMIN" "CHECK" "TABLE" TableNameList
	{
		$$ = &ast.AdminStmt{
			Tp:     ast.AdminCheckTable,
			Tables: $4.([]*ast.TableName),
		}
	}
|	"ADMIN" "CHECK" "INDEX" TableName Identifier
	{
		$$ = &ast.AdminStmt{
			Tp:     ast.AdminCheckIndex,
			Tables: []*ast.TableName{$4.(*ast.TableName)},
			Index:  string($5),
		}
	}
|	"ADMIN" "RECOVER" "INDEX" TableName Identifier
	{
		$$ = &ast.AdminStmt{
			Tp:     ast.AdminRecoverIndex,
			Tables: []*ast.TableName{$4.(*ast.TableName)},
			Index:  string($5),
		}
	}
|	"ADMIN" "CLEANUP" "INDEX" TableName Identifier
	{
		$$ = &ast.AdminStmt{
			Tp:     ast.AdminCleanupIndex,
			Tables: []*ast.TableName{$4.(*ast.TableName)},
			Index:  string($5),
		}
	}
|	"ADMIN" "CHECK" "INDEX" TableName Identifier HandleRangeList
	{
		$$ = &ast.AdminStmt{
			Tp:           ast.AdminCheckIndexRange,
			Tables:       []*ast.TableName{$4.(*ast.TableName)},
			Index:        string($5),
			HandleRanges: $6.([]ast.HandleRange),
		}
	}
|	"ADMIN" "CHECKSUM" "TABLE" TableNameList
	{
		$$ = &ast.AdminStmt{
			Tp:     ast.AdminChecksumTable,
			Tables: $4.([]*ast.TableName),
		}
	}
|	"ADMIN" "CANCEL" "DDL" "JOBS" NumList
	{
		$$ = &ast.AdminStmt{
			Tp:     ast.AdminCancelDDLJobs,
			JobIDs: $5.([]int64),
		}
	}
|	"ADMIN" "SHOW" "DDL" "JOB" "QUERIES" NumList
	{
		$$ = &ast.AdminStmt{
			Tp:     ast.AdminShowDDLJobQueries,
			JobIDs: $6.([]int64),
		}
	}
|	"ADMIN" "SHOW" "SLOW" AdminShowSlow
	{
		$$ = &ast.AdminStmt{
			Tp:       ast.AdminShowSlow,
			ShowSlow: $4.(*ast.ShowSlow),
		}
	}
|	"ADMIN" "RELOAD" "EXPR_PUSHDOWN_BLACKLIST"
	{
		$$ = &ast.AdminStmt{
			Tp: ast.AdminReloadExprPushdownBlacklist,
		}
	}
|	"ADMIN" "RELOAD" "OPT_RULE_BLACKLIST"
	{
		$$ = &ast.AdminStmt{
			Tp: ast.AdminReloadOptRuleBlacklist,
		}
	}
|	"ADMIN" "PLUGINS" "ENABLE" PluginNameList
	{
		$$ = &ast.AdminStmt{
			Tp:      ast.AdminPluginEnable,
			Plugins: $4.([]string),
		}
	}
|	"ADMIN" "PLUGINS" "DISABLE" PluginNameList
	{
		$$ = &ast.AdminStmt{
			Tp:      ast.AdminPluginDisable,
			Plugins: $4.([]string),
		}
	}
|	"ADMIN" "CLEANUP" "TABLE" "LOCK" TableNameList
	{
		$$ = &ast.CleanupTableLockStmt{
			Tables: $5.([]*ast.TableName),
		}
	}
|	"ADMIN" "REPAIR" "TABLE" TableName CreateTableStmt
	{
		$$ = &ast.RepairTableStmt{
			Table:      $4.(*ast.TableName),
			CreateStmt: $5.(*ast.CreateTableStmt),
		}
	}
|	"ADMIN" "FLUSH" "BINDINGS"
	{
		$$ = &ast.AdminStmt{
			Tp: ast.AdminFlushBindings,
		}
	}
|	"ADMIN" "CAPTURE" "BINDINGS"
	{
		$$ = &ast.AdminStmt{
			Tp: ast.AdminCaptureBindings,
		}
	}
|	"ADMIN" "EVOLVE" "BINDINGS"
	{
		$$ = &ast.AdminStmt{
			Tp: ast.AdminEvolveBindings,
		}
	}
|	"ADMIN" "RELOAD" "BINDINGS"
	{
		$$ = &ast.AdminStmt{
			Tp: ast.AdminReloadBindings,
		}
	}
|	"ADMIN" "RELOAD" "TIDB_STATS"
	{
		$$ = &ast.AdminStmt{
			Tp: ast.AdminReloadStatistics,
		}
	}
|	"ADMIN" "RELOAD" "STATISTICS"
	{
		$$ = &ast.AdminStmt{
			Tp: ast.AdminReloadStatistics,
		}
	}
|	"ADMIN" "SHOW" "TELEMETRY"
	{
		$$ = &ast.AdminStmt{
			Tp: ast.AdminShowTelemetry,
		}
	}
|	"ADMIN" "RESET" "TELEMETRY_ID"
	{
		$$ = &ast.AdminStmt{
			Tp: ast.AdminResetTelemetryID,
		}
	}

AdminShowSlow:
	"RECENT" NUM
	{
		$$ = &ast.ShowSlow{
			Tp:    ast.ShowSlowRecent,
			Count: getUint64FromNUM($2),
		}
	}
|	"TOP" NUM
	{
		$$ = &ast.ShowSlow{
			Tp:    ast.ShowSlowTop,
			Kind:  ast.ShowSlowKindDefault,
			Count: getUint64FromNUM($2),
		}
	}
|	"TOP" "INTERNAL" NUM
	{
		$$ = &ast.ShowSlow{
			Tp:    ast.ShowSlowTop,
			Kind:  ast.ShowSlowKindInternal,
			Count: getUint64FromNUM($3),
		}
	}
|	"TOP" "ALL" NUM
	{
		$$ = &ast.ShowSlow{
			Tp:    ast.ShowSlowTop,
			Kind:  ast.ShowSlowKindAll,
			Count: getUint64FromNUM($3),
		}
	}

HandleRangeList:
	HandleRange
	{
		$$ = []ast.HandleRange{$1.(ast.HandleRange)}
	}
|	HandleRangeList ',' HandleRange
	{
		$$ = append($1.([]ast.HandleRange), $3.(ast.HandleRange))
	}

HandleRange:
	'(' Int64Num ',' Int64Num ')'
	{
		$$ = ast.HandleRange{Begin: $2.(int64), End: $4.(int64)}
	}

NumList:
	Int64Num
	{
		$$ = []int64{$1.(int64)}
	}
|	NumList ',' Int64Num
	{
		$$ = append($1.([]int64), $3.(int64))
	}

/****************************Show Statement*******************************/
ShowStmt:
	"SHOW" ShowTargetFilterable ShowLikeOrWhereOpt
	{
		stmt := $2.(*ast.ShowStmt)
		if $3 != nil {
			if x, ok := $3.(*ast.PatternLikeExpr); ok && x.Expr == nil {
				stmt.Pattern = x
			} else {
				stmt.Where = $3.(ast.ExprNode)
			}
		}
		$$ = stmt
	}
|	"SHOW" "CREATE" "TABLE" TableName
	{
		$$ = &ast.ShowStmt{
			Tp:    ast.ShowCreateTable,
			Table: $4.(*ast.TableName),
		}
	}
|	"SHOW" "CREATE" "VIEW" TableName
	{
		$$ = &ast.ShowStmt{
			Tp:    ast.ShowCreateView,
			Table: $4.(*ast.TableName),
		}
	}
|	"SHOW" "CREATE" "DATABASE" IfNotExists DBName
	{
		$$ = &ast.ShowStmt{
			Tp:          ast.ShowCreateDatabase,
			IfNotExists: $4.(bool),
			DBName:      $5,
		}
	}
|	"SHOW" "CREATE" "SEQUENCE" TableName
	{
		$$ = &ast.ShowStmt{
			Tp:    ast.ShowCreateSequence,
			Table: $4.(*ast.TableName),
		}
	}
|	"SHOW" "CREATE" "USER" Username
	{
		// See https://dev.mysql.com/doc/refman/5.7/en/show-create-user.html
		$$ = &ast.ShowStmt{
			Tp:   ast.ShowCreateUser,
			User: $4.(*auth.UserIdentity),
		}
	}
|	"SHOW" "TABLE" TableName PartitionNameListOpt "REGIONS" WhereClauseOptional
	{
		stmt := &ast.ShowStmt{
			Tp:    ast.ShowRegions,
			Table: $3.(*ast.TableName),
		}
		stmt.Table.PartitionNames = $4.([]model.CIStr)
		if $6 != nil {
			stmt.Where = $6.(ast.ExprNode)
		}
		$$ = stmt
	}
|	"SHOW" "TABLE" TableName "NEXT_ROW_ID"
	{
		$$ = &ast.ShowStmt{
			Tp:    ast.ShowTableNextRowId,
			Table: $3.(*ast.TableName),
		}
	}
|	"SHOW" "TABLE" TableName PartitionNameListOpt "INDEX" Identifier "REGIONS" WhereClauseOptional
	{
		stmt := &ast.ShowStmt{
			Tp:        ast.ShowRegions,
			Table:     $3.(*ast.TableName),
			IndexName: model.NewCIStr($6),
		}
		stmt.Table.PartitionNames = $4.([]model.CIStr)
		if $8 != nil {
			stmt.Where = $8.(ast.ExprNode)
		}
		$$ = stmt
	}
|	"SHOW" "GRANTS"
	{
		// See https://dev.mysql.com/doc/refman/5.7/en/show-grants.html
		$$ = &ast.ShowStmt{Tp: ast.ShowGrants}
	}
|	"SHOW" "GRANTS" "FOR" Username UsingRoles
	{
		// See https://dev.mysql.com/doc/refman/5.7/en/show-grants.html
		if $5 != nil {
			$$ = &ast.ShowStmt{
				Tp:    ast.ShowGrants,
				User:  $4.(*auth.UserIdentity),
				Roles: $5.([]*auth.RoleIdentity),
			}
		} else {
			$$ = &ast.ShowStmt{
				Tp:    ast.ShowGrants,
				User:  $4.(*auth.UserIdentity),
				Roles: nil,
			}
		}
	}
|	"SHOW" "MASTER" "STATUS"
	{
		$$ = &ast.ShowStmt{
			Tp: ast.ShowMasterStatus,
		}
	}
|	"SHOW" OptFull "PROCESSLIST"
	{
		$$ = &ast.ShowStmt{
			Tp:   ast.ShowProcessList,
			Full: $2.(bool),
		}
	}
|	"SHOW" "PROFILES"
	{
		$$ = &ast.ShowStmt{
			Tp: ast.ShowProfiles,
		}
	}
|	"SHOW" "PROFILE" ShowProfileTypesOpt ShowProfileArgsOpt SelectStmtLimitOpt
	{
		v := &ast.ShowStmt{
			Tp: ast.ShowProfile,
		}
		if $3 != nil {
			v.ShowProfileTypes = $3.([]int)
		}
		if $4 != nil {
			v.ShowProfileArgs = $4.(*int64)
		}
		if $5 != nil {
			v.ShowProfileLimit = $5.(*ast.Limit)
		}
		$$ = v
	}
|	"SHOW" "PRIVILEGES"
	{
		$$ = &ast.ShowStmt{
			Tp: ast.ShowPrivileges,
		}
	}
|	"SHOW" "BUILTINS"
	{
		$$ = &ast.ShowStmt{
			Tp: ast.ShowBuiltins,
		}
	}

ShowProfileTypesOpt:
	{
		$$ = nil
	}
|	ShowProfileTypes

ShowProfileTypes:
	ShowProfileType
	{
		$$ = []int{$1.(int)}
	}
|	ShowProfileTypes ',' ShowProfileType
	{
		l := $1.([]int)
		l = append(l, $3.(int))
		$$ = l
	}

ShowProfileType:
	"CPU"
	{
		$$ = ast.ProfileTypeCPU
	}
|	"MEMORY"
	{
		$$ = ast.ProfileTypeMemory
	}
|	"BLOCK" "IO"
	{
		$$ = ast.ProfileTypeBlockIo
	}
|	"CONTEXT" "SWITCHES"
	{
		$$ = ast.ProfileTypeContextSwitch
	}
|	"PAGE" "FAULTS"
	{
		$$ = ast.ProfileTypePageFaults
	}
|	"IPC"
	{
		$$ = ast.ProfileTypeIpc
	}
|	"SWAPS"
	{
		$$ = ast.ProfileTypeSwaps
	}
|	"SOURCE"
	{
		$$ = ast.ProfileTypeSource
	}
|	"ALL"
	{
		$$ = ast.ProfileTypeAll
	}

ShowProfileArgsOpt:
	{
		$$ = nil
	}
|	"FOR" "QUERY" Int64Num
	{
		v := $3.(int64)
		$$ = &v
	}

UsingRoles:
	{
		$$ = nil
	}
|	"USING" RolenameList
	{
		$$ = $2.([]*auth.RoleIdentity)
	}

ShowIndexKwd:
	"INDEX"
|	"INDEXES"
|	"KEYS"

FromOrIn:
	"FROM"
|	"IN"

ShowTargetFilterable:
	"ENGINES"
	{
		$$ = &ast.ShowStmt{Tp: ast.ShowEngines}
	}
|	"DATABASES"
	{
		$$ = &ast.ShowStmt{Tp: ast.ShowDatabases}
	}
|	"CONFIG"
	{
		$$ = &ast.ShowStmt{Tp: ast.ShowConfig}
	}
|	CharsetKw
	{
		$$ = &ast.ShowStmt{Tp: ast.ShowCharset}
	}
|	OptFull "TABLES" ShowDatabaseNameOpt
	{
		$$ = &ast.ShowStmt{
			Tp:     ast.ShowTables,
			DBName: $3,
			Full:   $1.(bool),
		}
	}
|	"OPEN" "TABLES" ShowDatabaseNameOpt
	{
		$$ = &ast.ShowStmt{
			Tp:     ast.ShowOpenTables,
			DBName: $3,
		}
	}
|	"TABLE" "STATUS" ShowDatabaseNameOpt
	{
		$$ = &ast.ShowStmt{
			Tp:     ast.ShowTableStatus,
			DBName: $3,
		}
	}
|	ShowIndexKwd FromOrIn TableName
	{
		$$ = &ast.ShowStmt{
			Tp:    ast.ShowIndex,
			Table: $3.(*ast.TableName),
		}
	}
|	ShowIndexKwd FromOrIn Identifier FromOrIn Identifier
	{
		show := &ast.ShowStmt{
			Tp:    ast.ShowIndex,
			Table: &ast.TableName{Name: model.NewCIStr($3), Schema: model.NewCIStr($5)},
		}
		$$ = show
	}
|	OptFull FieldsOrColumns ShowTableAliasOpt ShowDatabaseNameOpt
	{
		$$ = &ast.ShowStmt{
			Tp:     ast.ShowColumns,
			Table:  $3.(*ast.TableName),
			DBName: $4,
			Full:   $1.(bool),
		}
	}
|	"EXTENDED" OptFull FieldsOrColumns ShowTableAliasOpt ShowDatabaseNameOpt
	{
		$$ = &ast.ShowStmt{
			Tp:       ast.ShowColumns,
			Table:    $4.(*ast.TableName),
			DBName:   $5,
			Full:     $2.(bool),
			Extended: true,
		}
	}
|	"WARNINGS"
	{
		$$ = &ast.ShowStmt{Tp: ast.ShowWarnings}
	}
|	"ERRORS"
	{
		$$ = &ast.ShowStmt{Tp: ast.ShowErrors}
	}
|	GlobalScope "VARIABLES"
	{
		$$ = &ast.ShowStmt{
			Tp:          ast.ShowVariables,
			GlobalScope: $1.(bool),
		}
	}
|	GlobalScope "STATUS"
	{
		$$ = &ast.ShowStmt{
			Tp:          ast.ShowStatus,
			GlobalScope: $1.(bool),
		}
	}
|	GlobalScope "BINDINGS"
	{
		$$ = &ast.ShowStmt{
			Tp:          ast.ShowBindings,
			GlobalScope: $1.(bool),
		}
	}
|	"COLLATION"
	{
		$$ = &ast.ShowStmt{
			Tp: ast.ShowCollation,
		}
	}
|	"TRIGGERS" ShowDatabaseNameOpt
	{
		$$ = &ast.ShowStmt{
			Tp:     ast.ShowTriggers,
			DBName: $2,
		}
	}
|	"PROCEDURE" "STATUS"
	{
		$$ = &ast.ShowStmt{
			Tp: ast.ShowProcedureStatus,
		}
	}
|	"PUMP" "STATUS"
	{
		$$ = &ast.ShowStmt{
			Tp: ast.ShowPumpStatus,
		}
	}
|	"DRAINER" "STATUS"
	{
		$$ = &ast.ShowStmt{
			Tp: ast.ShowDrainerStatus,
		}
	}
|	"FUNCTION" "STATUS"
	{
		// This statement is similar to SHOW PROCEDURE STATUS but for stored functions.
		// See http://dev.mysql.com/doc/refman/5.7/en/show-function-status.html
		// We do not support neither stored functions nor stored procedures.
		// So we reuse show procedure status process logic.
		$$ = &ast.ShowStmt{
			Tp: ast.ShowProcedureStatus,
		}
	}
|	"EVENTS" ShowDatabaseNameOpt
	{
		$$ = &ast.ShowStmt{
			Tp:     ast.ShowEvents,
			DBName: $2,
		}
	}
|	"PLUGINS"
	{
		$$ = &ast.ShowStmt{
			Tp: ast.ShowPlugins,
		}
	}
|	"STATS_META"
	{
		$$ = &ast.ShowStmt{Tp: ast.ShowStatsMeta}
	}
|	"STATS_HISTOGRAMS"
	{
		$$ = &ast.ShowStmt{Tp: ast.ShowStatsHistograms}
	}
|	"STATS_TOPN"
	{
		$$ = &ast.ShowStmt{Tp: ast.ShowStatsTopN}
	}
|	"STATS_BUCKETS"
	{
		$$ = &ast.ShowStmt{Tp: ast.ShowStatsBuckets}
	}
|	"STATS_HEALTHY"
	{
		$$ = &ast.ShowStmt{Tp: ast.ShowStatsHealthy}
	}
|	"ANALYZE" "STATUS"
	{
		$$ = &ast.ShowStmt{Tp: ast.ShowAnalyzeStatus}
	}
|	"BACKUPS"
	{
		$$ = &ast.ShowStmt{Tp: ast.ShowBackups}
	}
|	"RESTORES"
	{
		$$ = &ast.ShowStmt{Tp: ast.ShowRestores}
	}
|	"IMPORTS"
	{
		$$ = &ast.ShowStmt{Tp: ast.ShowImports}
	}

ShowLikeOrWhereOpt:
	{
		$$ = nil
	}
|	"LIKE" SimpleExpr
	{
		$$ = &ast.PatternLikeExpr{
			Pattern: $2,
			Escape:  '\\',
		}
	}
|	"WHERE" Expression
	{
		$$ = $2
	}

GlobalScope:
	{
		$$ = false
	}
|	"GLOBAL"
	{
		$$ = true
	}
|	"SESSION"
	{
		$$ = false
	}

OptFull:
	{
		$$ = false
	}
|	"FULL"
	{
		$$ = true
	}

ShowDatabaseNameOpt:
	{
		$$ = ""
	}
|	FromOrIn DBName
	{
		$$ = $2
	}

ShowTableAliasOpt:
	FromOrIn TableName
	{
		$$ = $2.(*ast.TableName)
	}

FlushStmt:
	"FLUSH" NoWriteToBinLogAliasOpt FlushOption
	{
		tmp := $3.(*ast.FlushStmt)
		tmp.NoWriteToBinLog = $2.(bool)
		$$ = tmp
	}

PluginNameList:
	Identifier
	{
		$$ = []string{$1}
	}
|	PluginNameList ',' Identifier
	{
		$$ = append($1.([]string), $3)
	}

FlushOption:
	"PRIVILEGES"
	{
		$$ = &ast.FlushStmt{
			Tp: ast.FlushPrivileges,
		}
	}
|	"STATUS"
	{
		$$ = &ast.FlushStmt{
			Tp: ast.FlushStatus,
		}
	}
|	"TIDB" "PLUGINS" PluginNameList
	{
		$$ = &ast.FlushStmt{
			Tp:      ast.FlushTiDBPlugin,
			Plugins: $3.([]string),
		}
	}
|	"HOSTS"
	{
		$$ = &ast.FlushStmt{
			Tp: ast.FlushHosts,
		}
	}
|	LogTypeOpt "LOGS"
	{
		$$ = &ast.FlushStmt{
			Tp:      ast.FlushLogs,
			LogType: $1.(ast.LogType),
		}
	}
|	TableOrTables TableNameListOpt WithReadLockOpt
	{
		$$ = &ast.FlushStmt{
			Tp:       ast.FlushTables,
			Tables:   $2.([]*ast.TableName),
			ReadLock: $3.(bool),
		}
	}

LogTypeOpt:
	/* empty */
	{
		$$ = ast.LogTypeDefault
	}
|	"BINARY"
	{
		$$ = ast.LogTypeBinary
	}
|	"ENGINE"
	{
		$$ = ast.LogTypeEngine
	}
|	"ERROR"
	{
		$$ = ast.LogTypeError
	}
|	"GENERAL"
	{
		$$ = ast.LogTypeGeneral
	}
|	"SLOW"
	{
		$$ = ast.LogTypeSlow
	}

NoWriteToBinLogAliasOpt:
	%prec lowerThanLocal
	{
		$$ = false
	}
|	"NO_WRITE_TO_BINLOG"
	{
		$$ = true
	}
|	"LOCAL"
	{
		$$ = true
	}

TableNameListOpt:
	%prec empty
	{
		$$ = []*ast.TableName{}
	}
|	TableNameList

WithReadLockOpt:
	{
		$$ = false
	}
|	"WITH" "READ" "LOCK"
	{
		$$ = true
	}

Statement:
	EmptyStmt
|	AdminStmt
|	AlterDatabaseStmt
|	AlterTableStmt
|	AlterUserStmt
|	AlterInstanceStmt
|	AlterSequenceStmt
|	AnalyzeTableStmt
|	BeginTransactionStmt
|	BinlogStmt
|	BRIEStmt
|	CommitStmt
|	DeallocateStmt
|	DeleteFromStmt
|	ExecuteStmt
|	ExplainStmt
|	ChangeStmt
|	CreateDatabaseStmt
|	CreateIndexStmt
|	CreateTableStmt
|	CreateViewStmt
|	CreateUserStmt
|	CreateRoleStmt
|	CreateBindingStmt
|	CreateSequenceStmt
|	CreateStatisticsStmt
|	DoStmt
|	DropDatabaseStmt
|	DropIndexStmt
|	DropTableStmt
|	DropSequenceStmt
|	DropViewStmt
|	DropUserStmt
|	DropRoleStmt
|	DropStatisticsStmt
|	DropStatsStmt
|	DropBindingStmt
|	FlushStmt
|	FlashbackTableStmt
|	GrantStmt
|	GrantProxyStmt
|	GrantRoleStmt
|	CallStmt
|	InsertIntoStmt
|	IndexAdviseStmt
|	KillStmt
|	LoadDataStmt
|	LoadStatsStmt
|	PreparedStmt
|	PurgeImportStmt
|	RollbackStmt
|	RenameTableStmt
|	ReplaceIntoStmt
|	RecoverTableStmt
|	RevokeStmt
|	RevokeRoleStmt
|	SetOprStmt1
|	SetStmt
|	SetRoleStmt
|	SetDefaultRoleStmt
|	SplitRegionStmt
|	ShowStmt
|	SubSelect
	{
		// `(select 1)`; is a valid select statement
		// TODO: This is used to fix issue #320. There may be a better solution.
		$$ = $1.(*ast.SubqueryExpr).Query.(ast.StmtNode)
	}
|	TraceStmt
|	TruncateTableStmt
|	UpdateStmt
|	UseStmt
|	UnlockTablesStmt
|	LockTablesStmt
|	ShutdownStmt

TraceableStmt:
	DeleteFromStmt
|	UpdateStmt
|	InsertIntoStmt
|	ReplaceIntoStmt
|	SetOprStmt1
|	LoadDataStmt
|	BeginTransactionStmt
|	CommitStmt
|	RollbackStmt
|	SetStmt

ExplainableStmt:
	DeleteFromStmt
|	UpdateStmt
|	InsertIntoStmt
|	ReplaceIntoStmt
|	SetOprStmt1

StatementList:
	Statement
	{
		if $1 != nil {
			s := $1
			if lexer, ok := yylex.(stmtTexter); ok {
				s.SetText(lexer.stmtText())
			}
			parser.result = append(parser.result, s)
		}
	}
|	StatementList ';' Statement
	{
		if $3 != nil {
			s := $3
			if lexer, ok := yylex.(stmtTexter); ok {
				s.SetText(lexer.stmtText())
			}
			parser.result = append(parser.result, s)
		}
	}

Constraint:
	ConstraintKeywordOpt ConstraintElem
	{
		cst := $2.(*ast.Constraint)
		if $1 != nil {
			cst.Name = $1.(string)
		}
		$$ = cst
	}

CheckConstraintKeyword:
	"CHECK"
|	"CONSTRAINT"

TableElement:
	ColumnDef
|	Constraint

TableElementList:
	TableElement
	{
		if $1 != nil {
			$$ = []interface{}{$1.(interface{})}
		} else {
			$$ = []interface{}{}
		}
	}
|	TableElementList ',' TableElement
	{
		if $3 != nil {
			$$ = append($1.([]interface{}), $3)
		} else {
			$$ = $1
		}
	}

TableElementListOpt:
	/* empty */ %prec lowerThanCreateTableSelect
	{
		var columnDefs []*ast.ColumnDef
		var constraints []*ast.Constraint
		$$ = &ast.CreateTableStmt{
			Cols:        columnDefs,
			Constraints: constraints,
		}
	}
|	'(' TableElementList ')'
	{
		tes := $2.([]interface{})
		var columnDefs []*ast.ColumnDef
		var constraints []*ast.Constraint
		for _, te := range tes {
			switch te := te.(type) {
			case *ast.ColumnDef:
				columnDefs = append(columnDefs, te)
			case *ast.Constraint:
				constraints = append(constraints, te)
			}
		}
		$$ = &ast.CreateTableStmt{
			Cols:        columnDefs,
			Constraints: constraints,
		}
	}

TableOption:
	PartDefOption
|	DefaultKwdOpt CharsetKw EqOpt CharsetName
	{
		$$ = &ast.TableOption{Tp: ast.TableOptionCharset, StrValue: $4,
			UintValue: ast.TableOptionCharsetWithoutConvertTo}
	}
|	DefaultKwdOpt "COLLATE" EqOpt CollationName
	{
		$$ = &ast.TableOption{Tp: ast.TableOptionCollate, StrValue: $4,
			UintValue: ast.TableOptionCharsetWithoutConvertTo}
	}
|	"AUTO_INCREMENT" EqOpt LengthNum
	{
		$$ = &ast.TableOption{Tp: ast.TableOptionAutoIncrement, UintValue: $3.(uint64)}
	}
|	"AUTO_ID_CACHE" EqOpt LengthNum
	{
		$$ = &ast.TableOption{Tp: ast.TableOptionAutoIdCache, UintValue: $3.(uint64)}
	}
|	"AUTO_RANDOM_BASE" EqOpt LengthNum
	{
		$$ = &ast.TableOption{Tp: ast.TableOptionAutoRandomBase, UintValue: $3.(uint64)}
	}
|	"AVG_ROW_LENGTH" EqOpt LengthNum
	{
		$$ = &ast.TableOption{Tp: ast.TableOptionAvgRowLength, UintValue: $3.(uint64)}
	}
|	"CONNECTION" EqOpt stringLit
	{
		$$ = &ast.TableOption{Tp: ast.TableOptionConnection, StrValue: $3}
	}
|	"CHECKSUM" EqOpt LengthNum
	{
		$$ = &ast.TableOption{Tp: ast.TableOptionCheckSum, UintValue: $3.(uint64)}
	}
|	"TABLE_CHECKSUM" EqOpt LengthNum
	{
		$$ = &ast.TableOption{Tp: ast.TableOptionTableCheckSum, UintValue: $3.(uint64)}
	}
|	"PASSWORD" EqOpt stringLit
	{
		$$ = &ast.TableOption{Tp: ast.TableOptionPassword, StrValue: $3}
	}
|	"COMPRESSION" EqOpt stringLit
	{
		$$ = &ast.TableOption{Tp: ast.TableOptionCompression, StrValue: $3}
	}
|	"KEY_BLOCK_SIZE" EqOpt LengthNum
	{
		$$ = &ast.TableOption{Tp: ast.TableOptionKeyBlockSize, UintValue: $3.(uint64)}
	}
|	"DELAY_KEY_WRITE" EqOpt LengthNum
	{
		$$ = &ast.TableOption{Tp: ast.TableOptionDelayKeyWrite, UintValue: $3.(uint64)}
	}
|	RowFormat
	{
		$$ = &ast.TableOption{Tp: ast.TableOptionRowFormat, UintValue: $1.(uint64)}
	}
|	"STATS_PERSISTENT" EqOpt StatsPersistentVal
	{
		$$ = &ast.TableOption{Tp: ast.TableOptionStatsPersistent}
	}
|	"STATS_AUTO_RECALC" EqOpt LengthNum
	{
		n := $3.(uint64)
		if n != 0 && n != 1 {
			yylex.AppendError(yylex.Errorf("The value of STATS_AUTO_RECALC must be one of [0|1|DEFAULT]."))
			return 1
		}
		$$ = &ast.TableOption{Tp: ast.TableOptionStatsAutoRecalc, UintValue: n}
		yylex.AppendError(yylex.Errorf("The STATS_AUTO_RECALC is parsed but ignored by all storage engines."))
		parser.lastErrorAsWarn()
	}
|	"STATS_AUTO_RECALC" EqOpt "DEFAULT"
	{
		$$ = &ast.TableOption{Tp: ast.TableOptionStatsAutoRecalc, Default: true}
		yylex.AppendError(yylex.Errorf("The STATS_AUTO_RECALC is parsed but ignored by all storage engines."))
		parser.lastErrorAsWarn()
	}
|	"STATS_SAMPLE_PAGES" EqOpt LengthNum
	{
		// Parse it but will ignore it.
		// In MySQL, STATS_SAMPLE_PAGES=N(Where 0<N<=65535) or STAS_SAMPLE_PAGES=DEFAULT.
		// Cause we don't support it, so we don't check range of the value.
		$$ = &ast.TableOption{Tp: ast.TableOptionStatsSamplePages, UintValue: $3.(uint64)}
		yylex.AppendError(yylex.Errorf("The STATS_SAMPLE_PAGES is parsed but ignored by all storage engines."))
		parser.lastErrorAsWarn()
	}
|	"STATS_SAMPLE_PAGES" EqOpt "DEFAULT"
	{
		// Parse it but will ignore it.
		// In MySQL, default value of STATS_SAMPLE_PAGES is 0.
		$$ = &ast.TableOption{Tp: ast.TableOptionStatsSamplePages, Default: true}
		yylex.AppendError(yylex.Errorf("The STATS_SAMPLE_PAGES is parsed but ignored by all storage engines."))
		parser.lastErrorAsWarn()
	}
|	"SHARD_ROW_ID_BITS" EqOpt LengthNum
	{
		$$ = &ast.TableOption{Tp: ast.TableOptionShardRowID, UintValue: $3.(uint64)}
	}
|	"PRE_SPLIT_REGIONS" EqOpt LengthNum
	{
		$$ = &ast.TableOption{Tp: ast.TableOptionPreSplitRegion, UintValue: $3.(uint64)}
	}
|	"PACK_KEYS" EqOpt StatsPersistentVal
	{
		// Parse it but will ignore it.
		$$ = &ast.TableOption{Tp: ast.TableOptionPackKeys}
	}
|	"STORAGE" "MEMORY"
	{
		// Parse it but will ignore it.
		$$ = &ast.TableOption{Tp: ast.TableOptionStorageMedia, StrValue: "MEMORY"}
		yylex.AppendError(yylex.Errorf("The STORAGE clause is parsed but ignored by all storage engines."))
		parser.lastErrorAsWarn()
	}
|	"STORAGE" "DISK"
	{
		// Parse it but will ignore it.
		$$ = &ast.TableOption{Tp: ast.TableOptionStorageMedia, StrValue: "DISK"}
		yylex.AppendError(yylex.Errorf("The STORAGE clause is parsed but ignored by all storage engines."))
		parser.lastErrorAsWarn()
	}
|	"SECONDARY_ENGINE" EqOpt "NULL"
	{
		// Parse it but will ignore it
		// See https://github.com/mysql/mysql-server/blob/8.0/sql/sql_yacc.yy#L5977-L5984
		$$ = &ast.TableOption{Tp: ast.TableOptionSecondaryEngineNull}
		yylex.AppendError(yylex.Errorf("The SECONDARY_ENGINE clause is parsed but ignored by all storage engines."))
		parser.lastErrorAsWarn()
	}
|	"SECONDARY_ENGINE" EqOpt StringName
	{
		// Parse it but will ignore it
		// See https://github.com/mysql/mysql-server/blob/8.0/sql/sql_yacc.yy#L5977-L5984
		$$ = &ast.TableOption{Tp: ast.TableOptionSecondaryEngine, StrValue: $3}
		yylex.AppendError(yylex.Errorf("The SECONDARY_ENGINE clause is parsed but ignored by all storage engines."))
		parser.lastErrorAsWarn()
	}
|	"UNION" EqOpt '(' TableNameListOpt ')'
	{
		// Parse it but will ignore it
		$$ = &ast.TableOption{
			Tp:         ast.TableOptionUnion,
			TableNames: $4.([]*ast.TableName),
		}
		yylex.AppendError(yylex.Errorf("The UNION option is parsed but ignored by all storage engines."))
		parser.lastErrorAsWarn()
	}
|	"ENCRYPTION" EqOpt EncryptionOpt
	{
		// Parse it but will ignore it
		$$ = &ast.TableOption{Tp: ast.TableOptionEncryption, StrValue: $3}
	}

StatsPersistentVal:
	"DEFAULT"
	{}
|	LengthNum
	{}

CreateTableOptionListOpt:
	/* empty */ %prec lowerThanCreateTableSelect
	{
		$$ = []*ast.TableOption{}
	}
|	TableOptionList %prec lowerThanComma

TableOptionList:
	TableOption
	{
		$$ = []*ast.TableOption{$1.(*ast.TableOption)}
	}
|	TableOptionList TableOption
	{
		$$ = append($1.([]*ast.TableOption), $2.(*ast.TableOption))
	}
|	TableOptionList ',' TableOption
	{
		$$ = append($1.([]*ast.TableOption), $3.(*ast.TableOption))
	}

OptTable:
	{}
|	"TABLE"

TruncateTableStmt:
	"TRUNCATE" OptTable TableName
	{
		$$ = &ast.TruncateTableStmt{Table: $3.(*ast.TableName)}
	}

RowFormat:
	"ROW_FORMAT" EqOpt "DEFAULT"
	{
		$$ = ast.RowFormatDefault
	}
|	"ROW_FORMAT" EqOpt "DYNAMIC"
	{
		$$ = ast.RowFormatDynamic
	}
|	"ROW_FORMAT" EqOpt "FIXED"
	{
		$$ = ast.RowFormatFixed
	}
|	"ROW_FORMAT" EqOpt "COMPRESSED"
	{
		$$ = ast.RowFormatCompressed
	}
|	"ROW_FORMAT" EqOpt "REDUNDANT"
	{
		$$ = ast.RowFormatRedundant
	}
|	"ROW_FORMAT" EqOpt "COMPACT"
	{
		$$ = ast.RowFormatCompact
	}
|	"ROW_FORMAT" EqOpt "TOKUDB_DEFAULT"
	{
		$$ = ast.TokuDBRowFormatDefault
	}
|	"ROW_FORMAT" EqOpt "TOKUDB_FAST"
	{
		$$ = ast.TokuDBRowFormatFast
	}
|	"ROW_FORMAT" EqOpt "TOKUDB_SMALL"
	{
		$$ = ast.TokuDBRowFormatSmall
	}
|	"ROW_FORMAT" EqOpt "TOKUDB_ZLIB"
	{
		$$ = ast.TokuDBRowFormatZlib
	}
|	"ROW_FORMAT" EqOpt "TOKUDB_QUICKLZ"
	{
		$$ = ast.TokuDBRowFormatQuickLZ
	}
|	"ROW_FORMAT" EqOpt "TOKUDB_LZMA"
	{
		$$ = ast.TokuDBRowFormatLzma
	}
|	"ROW_FORMAT" EqOpt "TOKUDB_SNAPPY"
	{
		$$ = ast.TokuDBRowFormatSnappy
	}
|	"ROW_FORMAT" EqOpt "TOKUDB_UNCOMPRESSED"
	{
		$$ = ast.TokuDBRowFormatUncompressed
	}

/*************************************Type Begin***************************************/
Type:
	NumericType
|	StringType
|	DateAndTimeType

NumericType:
	IntegerType OptFieldLen FieldOpts
	{
		// TODO: check flen 0
		x := types.NewFieldType($1.(byte))
		x.Flen = $2.(int)
		if $2.(int) != types.UnspecifiedLength && types.TiDBStrictIntegerDisplayWidth {
			yylex.AppendError(ErrWarnDeprecatedIntegerDisplayWidth)
			parser.lastErrorAsWarn()
		}
		for _, o := range $3.([]*ast.TypeOpt) {
			if o.IsUnsigned {
				x.Flag |= mysql.UnsignedFlag
			}
			if o.IsZerofill {
				x.Flag |= mysql.ZerofillFlag
			}
		}
		$$ = x
	}
|	BooleanType FieldOpts
	{
		// TODO: check flen 0
		x := types.NewFieldType($1.(byte))
		x.Flen = 1
		for _, o := range $2.([]*ast.TypeOpt) {
			if o.IsUnsigned {
				x.Flag |= mysql.UnsignedFlag
			}
			if o.IsZerofill {
				x.Flag |= mysql.ZerofillFlag
			}
		}
		$$ = x
	}
|	FixedPointType FloatOpt FieldOpts
	{
		fopt := $2.(*ast.FloatOpt)
		x := types.NewFieldType($1.(byte))
		x.Flen = fopt.Flen
		x.Decimal = fopt.Decimal
		for _, o := range $3.([]*ast.TypeOpt) {
			if o.IsUnsigned {
				x.Flag |= mysql.UnsignedFlag
			}
			if o.IsZerofill {
				x.Flag |= mysql.ZerofillFlag
			}
		}
		$$ = x
	}
|	FloatingPointType FloatOpt FieldOpts
	{
		fopt := $2.(*ast.FloatOpt)
		x := types.NewFieldType($1.(byte))
		// check for a double(10) for syntax error
		if x.Tp == mysql.TypeDouble && parser.strictDoubleFieldType {
			if fopt.Flen != types.UnspecifiedLength && fopt.Decimal == types.UnspecifiedLength {
				yylex.AppendError(ErrSyntax)
				return 1
			}
		}
		x.Flen = fopt.Flen
		if x.Tp == mysql.TypeFloat && fopt.Decimal == types.UnspecifiedLength && x.Flen <= mysql.MaxDoublePrecisionLength {
			if x.Flen > mysql.MaxFloatPrecisionLength {
				x.Tp = mysql.TypeDouble
			}
			x.Flen = types.UnspecifiedLength
		}
		x.Decimal = fopt.Decimal
		for _, o := range $3.([]*ast.TypeOpt) {
			if o.IsUnsigned {
				x.Flag |= mysql.UnsignedFlag
			}
			if o.IsZerofill {
				x.Flag |= mysql.ZerofillFlag
			}
		}
		$$ = x
	}
|	BitValueType OptFieldLen
	{
		x := types.NewFieldType($1.(byte))
		x.Flen = $2.(int)
		if x.Flen == types.UnspecifiedLength {
			x.Flen = 1
		}
		$$ = x
	}

IntegerType:
	"TINYINT"
	{
		$$ = mysql.TypeTiny
	}
|	"SMALLINT"
	{
		$$ = mysql.TypeShort
	}
|	"MEDIUMINT"
	{
		$$ = mysql.TypeInt24
	}
|	"INT"
	{
		$$ = mysql.TypeLong
	}
|	"INT1"
	{
		$$ = mysql.TypeTiny
	}
|	"INT2"
	{
		$$ = mysql.TypeShort
	}
|	"INT3"
	{
		$$ = mysql.TypeInt24
	}
|	"INT4"
	{
		$$ = mysql.TypeLong
	}
|	"INT8"
	{
		$$ = mysql.TypeLonglong
	}
|	"INTEGER"
	{
		$$ = mysql.TypeLong
	}
|	"BIGINT"
	{
		$$ = mysql.TypeLonglong
	}

BooleanType:
	"BOOL"
	{
		$$ = mysql.TypeTiny
	}
|	"BOOLEAN"
	{
		$$ = mysql.TypeTiny
	}

OptInteger:
	{}
|	"INTEGER"
|	"INT"

FixedPointType:
	"DECIMAL"
	{
		$$ = mysql.TypeNewDecimal
	}
|	"NUMERIC"
	{
		$$ = mysql.TypeNewDecimal
	}
|	"FIXED"
	{
		$$ = mysql.TypeNewDecimal
	}

FloatingPointType:
	"FLOAT"
	{
		$$ = mysql.TypeFloat
	}
|	"REAL"
	{
		if parser.lexer.GetSQLMode().HasRealAsFloatMode() {
			$$ = mysql.TypeFloat
		} else {
			$$ = mysql.TypeDouble
		}
	}
|	"DOUBLE"
	{
		$$ = mysql.TypeDouble
	}
|	"DOUBLE" "PRECISION"
	{
		$$ = mysql.TypeDouble
	}

BitValueType:
	"BIT"
	{
		$$ = mysql.TypeBit
	}

StringType:
	Char FieldLen OptBinary
	{
		x := types.NewFieldType(mysql.TypeString)
		x.Flen = $2.(int)
		x.Charset = $3.(*ast.OptBinary).Charset
		if $3.(*ast.OptBinary).IsBinary {
			x.Flag |= mysql.BinaryFlag
		}
		$$ = x
	}
|	Char OptBinary
	{
		x := types.NewFieldType(mysql.TypeString)
		x.Charset = $2.(*ast.OptBinary).Charset
		if $2.(*ast.OptBinary).IsBinary {
			x.Flag |= mysql.BinaryFlag
		}
		$$ = x
	}
|	NChar FieldLen OptBinary
	{
		x := types.NewFieldType(mysql.TypeString)
		x.Flen = $2.(int)
		x.Charset = $3.(*ast.OptBinary).Charset
		if $3.(*ast.OptBinary).IsBinary {
			x.Flag |= mysql.BinaryFlag
		}
		$$ = x
	}
|	NChar OptBinary
	{
		x := types.NewFieldType(mysql.TypeString)
		x.Charset = $2.(*ast.OptBinary).Charset
		if $2.(*ast.OptBinary).IsBinary {
			x.Flag |= mysql.BinaryFlag
		}
		$$ = x
	}
|	Varchar FieldLen OptBinary
	{
		x := types.NewFieldType(mysql.TypeVarchar)
		x.Flen = $2.(int)
		x.Charset = $3.(*ast.OptBinary).Charset
		if $3.(*ast.OptBinary).IsBinary {
			x.Flag |= mysql.BinaryFlag
		}
		$$ = x
	}
|	NVarchar FieldLen OptBinary
	{
		x := types.NewFieldType(mysql.TypeVarchar)
		x.Flen = $2.(int)
		x.Charset = $3.(*ast.OptBinary).Charset
		if $3.(*ast.OptBinary).IsBinary {
			x.Flag |= mysql.BinaryFlag
		}
		$$ = x
	}
|	"BINARY" OptFieldLen
	{
		x := types.NewFieldType(mysql.TypeString)
		x.Flen = $2.(int)
		x.Charset = charset.CharsetBin
		x.Collate = charset.CharsetBin
		x.Flag |= mysql.BinaryFlag
		$$ = x
	}
|	"VARBINARY" FieldLen
	{
		x := types.NewFieldType(mysql.TypeVarchar)
		x.Flen = $2.(int)
		x.Charset = charset.CharsetBin
		x.Collate = charset.CharsetBin
		x.Flag |= mysql.BinaryFlag
		$$ = x
	}
|	BlobType
	{
		x := $1.(*types.FieldType)
		x.Charset = charset.CharsetBin
		x.Collate = charset.CharsetBin
		x.Flag |= mysql.BinaryFlag
		$$ = x
	}
|	TextType OptCharsetWithOptBinary
	{
		x := $1.(*types.FieldType)
		x.Charset = $2.(*ast.OptBinary).Charset
		if $2.(*ast.OptBinary).IsBinary {
			x.Flag |= mysql.BinaryFlag
		}
		$$ = x
	}
|	"ENUM" '(' TextStringList ')' OptCharsetWithOptBinary
	{
		x := types.NewFieldType(mysql.TypeEnum)
		x.Elems = $3.([]string)
		fieldLen := -1 // enum_flen = max(ele_flen)
		for i := range x.Elems {
			x.Elems[i] = strings.TrimRight(x.Elems[i], " ")
			if len(x.Elems[i]) > fieldLen {
				fieldLen = len(x.Elems[i])
			}
		}
		x.Flen = fieldLen
		opt := $5.(*ast.OptBinary)
		x.Charset = opt.Charset
		if opt.IsBinary {
			x.Flag |= mysql.BinaryFlag
		}
		$$ = x
	}
|	"SET" '(' TextStringList ')' OptCharsetWithOptBinary
	{
		x := types.NewFieldType(mysql.TypeSet)
		x.Elems = $3.([]string)
		fieldLen := len(x.Elems) - 1 // set_flen = sum(ele_flen) + number_of_ele - 1
		for i := range x.Elems {
			x.Elems[i] = strings.TrimRight(x.Elems[i], " ")
			fieldLen += len(x.Elems[i])
		}
		x.Flen = fieldLen
		opt := $5.(*ast.OptBinary)
		x.Charset = opt.Charset
		if opt.IsBinary {
			x.Flag |= mysql.BinaryFlag
		}
		$$ = x
	}
|	"JSON"
	{
		x := types.NewFieldType(mysql.TypeJSON)
		x.Decimal = 0
		x.Charset = charset.CharsetBin
		x.Collate = charset.CollationBin
		$$ = x
	}
|	"LONG" Varchar OptCharsetWithOptBinary
	{
		x := types.NewFieldType(mysql.TypeMediumBlob)
		x.Charset = $3.(*ast.OptBinary).Charset
		if $3.(*ast.OptBinary).IsBinary {
			x.Flag |= mysql.BinaryFlag
		}
		$$ = x
	}
|	"LONG" OptCharsetWithOptBinary
	{
		x := types.NewFieldType(mysql.TypeMediumBlob)
		x.Charset = $2.(*ast.OptBinary).Charset
		if $2.(*ast.OptBinary).IsBinary {
			x.Flag |= mysql.BinaryFlag
		}
		$$ = x
	}

Char:
	"CHARACTER"
|	"CHAR"

NChar:
	"NCHAR"
|	"NATIONAL" "CHARACTER"
|	"NATIONAL" "CHAR"

Varchar:
	"CHARACTER" "VARYING"
|	"CHAR" "VARYING"
|	"VARCHAR"
|	"VARCHARACTER"

NVarchar:
	"NATIONAL" "VARCHAR"
|	"NATIONAL" "VARCHARACTER"
|	"NVARCHAR"
|	"NCHAR" "VARCHAR"
|	"NCHAR" "VARCHARACTER"
|	"NATIONAL" "CHARACTER" "VARYING"
|	"NATIONAL" "CHAR" "VARYING"
|	"NCHAR" "VARYING"

Year:
	"YEAR"
|	"SQL_TSI_YEAR"

BlobType:
	"TINYBLOB"
	{
		x := types.NewFieldType(mysql.TypeTinyBlob)
		$$ = x
	}
|	"BLOB" OptFieldLen
	{
		x := types.NewFieldType(mysql.TypeBlob)
		x.Flen = $2.(int)
		$$ = x
	}
|	"MEDIUMBLOB"
	{
		x := types.NewFieldType(mysql.TypeMediumBlob)
		$$ = x
	}
|	"LONGBLOB"
	{
		x := types.NewFieldType(mysql.TypeLongBlob)
		$$ = x
	}
|	"LONG" "VARBINARY"
	{
		x := types.NewFieldType(mysql.TypeMediumBlob)
		$$ = x
	}

TextType:
	"TINYTEXT"
	{
		x := types.NewFieldType(mysql.TypeTinyBlob)
		$$ = x
	}
|	"TEXT" OptFieldLen
	{
		x := types.NewFieldType(mysql.TypeBlob)
		x.Flen = $2.(int)
		$$ = x
	}
|	"MEDIUMTEXT"
	{
		x := types.NewFieldType(mysql.TypeMediumBlob)
		$$ = x
	}
|	"LONGTEXT"
	{
		x := types.NewFieldType(mysql.TypeLongBlob)
		$$ = x
	}

OptCharsetWithOptBinary:
	OptBinary
|	"ASCII"
	{
		$$ = &ast.OptBinary{
			IsBinary: false,
			Charset:  charset.CharsetLatin1,
		}
	}
|	"UNICODE"
	{
		name, _, err := charset.GetCharsetInfo("ucs2")
		if err != nil {
			yylex.AppendError(ErrUnknownCharacterSet.GenWithStackByArgs("ucs2"))
			return 1
		}
		$$ = &ast.OptBinary{
			IsBinary: false,
			Charset:  name,
		}
	}
|	"BYTE"
	{
		$$ = &ast.OptBinary{
			IsBinary: false,
			Charset:  "",
		}
	}

DateAndTimeType:
	"DATE"
	{
		x := types.NewFieldType(mysql.TypeDate)
		$$ = x
	}
|	"DATETIME" OptFieldLen
	{
		x := types.NewFieldType(mysql.TypeDatetime)
		x.Flen = mysql.MaxDatetimeWidthNoFsp
		x.Decimal = $2.(int)
		if x.Decimal > 0 {
			x.Flen = x.Flen + 1 + x.Decimal
		}
		$$ = x
	}
|	"TIMESTAMP" OptFieldLen
	{
		x := types.NewFieldType(mysql.TypeTimestamp)
		x.Flen = mysql.MaxDatetimeWidthNoFsp
		x.Decimal = $2.(int)
		if x.Decimal > 0 {
			x.Flen = x.Flen + 1 + x.Decimal
		}
		$$ = x
	}
|	"TIME" OptFieldLen
	{
		x := types.NewFieldType(mysql.TypeDuration)
		x.Flen = mysql.MaxDurationWidthNoFsp
		x.Decimal = $2.(int)
		if x.Decimal > 0 {
			x.Flen = x.Flen + 1 + x.Decimal
		}
		$$ = x
	}
|	Year OptFieldLen FieldOpts
	{
		x := types.NewFieldType(mysql.TypeYear)
		x.Flen = $2.(int)
		if x.Flen != types.UnspecifiedLength && x.Flen != 4 {
			yylex.AppendError(ErrInvalidYearColumnLength.GenWithStackByArgs())
			return -1
		}
		$$ = x
	}

FieldLen:
	'(' LengthNum ')'
	{
		$$ = int($2.(uint64))
	}

OptFieldLen:
	{
		$$ = types.UnspecifiedLength
	}
|	FieldLen

FieldOpt:
	"UNSIGNED"
	{
		$$ = &ast.TypeOpt{IsUnsigned: true}
	}
|	"SIGNED"
	{
		$$ = &ast.TypeOpt{IsUnsigned: false}
	}
|	"ZEROFILL"
	{
		$$ = &ast.TypeOpt{IsZerofill: true, IsUnsigned: true}
	}

FieldOpts:
	{
		$$ = []*ast.TypeOpt{}
	}
|	FieldOpts FieldOpt
	{
		$$ = append($1.([]*ast.TypeOpt), $2.(*ast.TypeOpt))
	}

FloatOpt:
	{
		$$ = &ast.FloatOpt{Flen: types.UnspecifiedLength, Decimal: types.UnspecifiedLength}
	}
|	FieldLen
	{
		$$ = &ast.FloatOpt{Flen: $1.(int), Decimal: types.UnspecifiedLength}
	}
|	Precision

Precision:
	'(' LengthNum ',' LengthNum ')'
	{
		$$ = &ast.FloatOpt{Flen: int($2.(uint64)), Decimal: int($4.(uint64))}
	}

OptBinMod:
	{
		$$ = false
	}
|	"BINARY"
	{
		$$ = true
	}

OptBinary:
	{
		$$ = &ast.OptBinary{
			IsBinary: false,
			Charset:  "",
		}
	}
|	"BINARY" OptCharset
	{
		$$ = &ast.OptBinary{
			IsBinary: true,
			Charset:  $2,
		}
	}
|	CharsetKw CharsetName OptBinMod
	{
		$$ = &ast.OptBinary{
			IsBinary: $3.(bool),
			Charset:  $2,
		}
	}

OptCharset:
	{
		$$ = ""
	}
|	CharsetKw CharsetName
	{
		$$ = $2
	}

CharsetKw:
	"CHARACTER" "SET"
|	"CHARSET"
|	"CHAR" "SET"

OptCollate:
	{
		$$ = ""
	}
|	"COLLATE" CollationName
	{
		$$ = $2
	}

StringList:
	stringLit
	{
		$$ = []string{$1}
	}
|	StringList ',' stringLit
	{
		$$ = append($1.([]string), $3)
	}

TextString:
	stringLit
|	hexLit
	{
		$$ = $1.(ast.BinaryLiteral).ToString()
	}
|	bitLit
	{
		$$ = $1.(ast.BinaryLiteral).ToString()
	}

TextStringList:
	TextString
	{
		$$ = []string{$1}
	}
|	TextStringList ',' TextString
	{
		$$ = append($1.([]string), $3)
	}

StringName:
	stringLit
|	Identifier

StringNameOrBRIEOptionKeyword:
	StringName
|	"IGNORE"
|	"REPLACE"

/***********************************************************************************
 * Update Statement
 * See https://dev.mysql.com/doc/refman/5.7/en/update.html
 ***********************************************************************************/
UpdateStmt:
	"UPDATE" TableOptimizerHintsOpt PriorityOpt IgnoreOptional TableRef "SET" AssignmentList WhereClauseOptional OrderByOptional LimitClause
	{
		var refs *ast.Join
		if x, ok := $5.(*ast.Join); ok {
			refs = x
		} else {
			refs = &ast.Join{Left: $5.(ast.ResultSetNode)}
		}
		st := &ast.UpdateStmt{
			Priority:  $3.(mysql.PriorityEnum),
			TableRefs: &ast.TableRefsClause{TableRefs: refs},
			List:      $7.([]*ast.Assignment),
			IgnoreErr: $4.(bool),
		}
		if $2 != nil {
			st.TableHints = $2.([]*ast.TableOptimizerHint)
		}
		if $8 != nil {
			st.Where = $8.(ast.ExprNode)
		}
		if $9 != nil {
			st.Order = $9.(*ast.OrderByClause)
		}
		if $10 != nil {
			st.Limit = $10.(*ast.Limit)
		}
		$$ = st
	}
|	"UPDATE" TableOptimizerHintsOpt PriorityOpt IgnoreOptional TableRefs "SET" AssignmentList WhereClauseOptional
	{
		st := &ast.UpdateStmt{
			Priority:  $3.(mysql.PriorityEnum),
			TableRefs: &ast.TableRefsClause{TableRefs: $5.(*ast.Join)},
			List:      $7.([]*ast.Assignment),
			IgnoreErr: $4.(bool),
		}
		if $2 != nil {
			st.TableHints = $2.([]*ast.TableOptimizerHint)
		}
		if $8 != nil {
			st.Where = $8.(ast.ExprNode)
		}
		$$ = st
	}

UseStmt:
	"USE" DBName
	{
		$$ = &ast.UseStmt{DBName: $2}
	}

WhereClause:
	"WHERE" Expression
	{
		$$ = $2
	}

WhereClauseOptional:
	{
		$$ = nil
	}
|	WhereClause

CommaOpt:
	{}
|	','
	{}

TraverseClause:
	"TRAVERSE" TraverseChain
	{
		$$ = &ast.TraverseChain{Verbs: $2.([]*ast.TraverseVerb)}
	}

TraverseOptional:
	{
		$$ = nil
	}
|	TraverseClause

TraverseChain:
	TraverseVerb
	{
		$$ = []*ast.TraverseVerb{$1.(*ast.TraverseVerb)}
	}
|	TraverseChain '.' TraverseVerb
	{
		$$ = append($1.([]*ast.TraverseVerb), $3.(*ast.TraverseVerb))
	}

TraverseVerb:
	"IN" '(' TraverseTargets ')'
	{
		$$ = &ast.TraverseVerb{Action: ast.TraverseActionIn, Targets: $3.([]*ast.TraverseTarget)}
	}
|	"BOTH" '(' TraverseTargets ')'
	{
		$$ = &ast.TraverseVerb{Action: ast.TraverseActionBoth, Targets: $3.([]*ast.TraverseTarget)}
	}
|	Identifier '(' TraverseTargets ')'
	{
		targets := $3.([]*ast.TraverseTarget)
		switch strings.ToUpper($1) {
		case "IN":
			$$ = &ast.TraverseVerb{Action: ast.TraverseActionIn, Targets: targets}
		case "OUT":
			$$ = &ast.TraverseVerb{Action: ast.TraverseActionOut, Targets: targets}
		case "BOTH":
			$$ = &ast.TraverseVerb{Action: ast.TraverseActionBoth, Targets: targets}
		case "TAG":
			$$ = &ast.TraverseVerb{Action: ast.TraverseActionTags, Targets: targets}
		default:
			// Invalid traverse verb
			$$ = &ast.TraverseVerb{Action: ast.TraverseAction(0xff), Targets: targets}
		}
	}

TraverseTargets:
	TableName WhereClauseOptional
	{
		where, _ := $2.(ast.ExprNode)
		target := &ast.TraverseTarget{
			Name:  $1.(*ast.TableName),
			Where: where,
		}
		tbl := []*ast.TraverseTarget{target}
		$$ = tbl
	}
|	TraverseTargets ',' TableName WhereClauseOptional
	{
		where, _ := $4.(ast.ExprNode)
		target := &ast.TraverseTarget{
			Name:  $3.(*ast.TableName),
			Where: where,
		}
		$$ = append($1.([]*ast.TraverseTarget), target)
	}

/************************************************************************************
 *  Account Management Statements
 *  https://dev.mysql.com/doc/refman/5.7/en/account-management-sql.html
 ************************************************************************************/
CreateUserStmt:
	"CREATE" "USER" IfNotExists UserSpecList RequireClauseOpt ConnectionOptions PasswordOrLockOptions
	{
		// See https://dev.mysql.com/doc/refman/5.7/en/create-user.html
		$$ = &ast.CreateUserStmt{
			IsCreateRole:          false,
			IfNotExists:           $3.(bool),
			Specs:                 $4.([]*ast.UserSpec),
			TLSOptions:            $5.([]*ast.TLSOption),
			ResourceOptions:       $6.([]*ast.ResourceOption),
			PasswordOrLockOptions: $7.([]*ast.PasswordOrLockOption),
		}
	}

CreateRoleStmt:
	"CREATE" "ROLE" IfNotExists RoleSpecList
	{
		// See https://dev.mysql.com/doc/refman/8.0/en/create-role.html
		$$ = &ast.CreateUserStmt{
			IsCreateRole: true,
			IfNotExists:  $3.(bool),
			Specs:        $4.([]*ast.UserSpec),
		}
	}

/* See http://dev.mysql.com/doc/refman/5.7/en/alter-user.html */
AlterUserStmt:
	"ALTER" "USER" IfExists UserSpecList RequireClauseOpt ConnectionOptions PasswordOrLockOptions
	{
		$$ = &ast.AlterUserStmt{
			IfExists:              $3.(bool),
			Specs:                 $4.([]*ast.UserSpec),
			TLSOptions:            $5.([]*ast.TLSOption),
			ResourceOptions:       $6.([]*ast.ResourceOption),
			PasswordOrLockOptions: $7.([]*ast.PasswordOrLockOption),
		}
	}
|	"ALTER" "USER" IfExists "USER" '(' ')' "IDENTIFIED" "BY" AuthString
	{
		auth := &ast.AuthOption{
			AuthString:   $9,
			ByAuthString: true,
		}
		$$ = &ast.AlterUserStmt{
			IfExists:    $3.(bool),
			CurrentAuth: auth,
		}
	}

/* See https://dev.mysql.com/doc/refman/8.0/en/alter-instance.html */
AlterInstanceStmt:
	"ALTER" "INSTANCE" InstanceOption
	{
		$$ = $3.(*ast.AlterInstanceStmt)
	}

InstanceOption:
	"RELOAD" "TLS"
	{
		$$ = &ast.AlterInstanceStmt{
			ReloadTLS: true,
		}
	}
|	"RELOAD" "TLS" "NO" "ROLLBACK" "ON" "ERROR"
	{
		$$ = &ast.AlterInstanceStmt{
			ReloadTLS:         true,
			NoRollbackOnError: true,
		}
	}

UserSpec:
	Username AuthOption
	{
		userSpec := &ast.UserSpec{
			User: $1.(*auth.UserIdentity),
		}
		if $2 != nil {
			userSpec.AuthOpt = $2.(*ast.AuthOption)
		}
		$$ = userSpec
	}

UserSpecList:
	UserSpec
	{
		$$ = []*ast.UserSpec{$1.(*ast.UserSpec)}
	}
|	UserSpecList ',' UserSpec
	{
		$$ = append($1.([]*ast.UserSpec), $3.(*ast.UserSpec))
	}

ConnectionOptions:
	{
		l := []*ast.ResourceOption{}
		$$ = l
	}
|	"WITH" ConnectionOptionList
	{
		$$ = $2
		yylex.AppendError(yylex.Errorf("TiDB does not support WITH ConnectionOptions now, they would be parsed but ignored."))
		parser.lastErrorAsWarn()
	}

ConnectionOptionList:
	ConnectionOption
	{
		$$ = []*ast.ResourceOption{$1.(*ast.ResourceOption)}
	}
|	ConnectionOptionList ConnectionOption
	{
		l := $1.([]*ast.ResourceOption)
		l = append(l, $2.(*ast.ResourceOption))
		$$ = l
	}

ConnectionOption:
	"MAX_QUERIES_PER_HOUR" Int64Num
	{
		$$ = &ast.ResourceOption{
			Type:  ast.MaxQueriesPerHour,
			Count: $2.(int64),
		}
	}
|	"MAX_UPDATES_PER_HOUR" Int64Num
	{
		$$ = &ast.ResourceOption{
			Type:  ast.MaxUpdatesPerHour,
			Count: $2.(int64),
		}
	}
|	"MAX_CONNECTIONS_PER_HOUR" Int64Num
	{
		$$ = &ast.ResourceOption{
			Type:  ast.MaxConnectionsPerHour,
			Count: $2.(int64),
		}
	}
|	"MAX_USER_CONNECTIONS" Int64Num
	{
		$$ = &ast.ResourceOption{
			Type:  ast.MaxUserConnections,
			Count: $2.(int64),
		}
	}

RequireClauseOpt:
	{
		$$ = []*ast.TLSOption{}
	}
|	RequireClause

RequireClause:
	"REQUIRE" "NONE"
	{
		t := &ast.TLSOption{
			Type: ast.TslNone,
		}
		$$ = []*ast.TLSOption{t}
	}
|	"REQUIRE" "SSL"
	{
		t := &ast.TLSOption{
			Type: ast.Ssl,
		}
		$$ = []*ast.TLSOption{t}
	}
|	"REQUIRE" "X509"
	{
		t := &ast.TLSOption{
			Type: ast.X509,
		}
		$$ = []*ast.TLSOption{t}
	}
|	"REQUIRE" RequireList
	{
		$$ = $2
	}

RequireList:
	RequireListElement
	{
		$$ = []*ast.TLSOption{$1.(*ast.TLSOption)}
	}
|	RequireList "AND" RequireListElement
	{
		l := $1.([]*ast.TLSOption)
		l = append(l, $3.(*ast.TLSOption))
		$$ = l
	}
|	RequireList RequireListElement
	{
		l := $1.([]*ast.TLSOption)
		l = append(l, $2.(*ast.TLSOption))
		$$ = l
	}

RequireListElement:
	"ISSUER" stringLit
	{
		$$ = &ast.TLSOption{
			Type:  ast.Issuer,
			Value: $2,
		}
	}
|	"SUBJECT" stringLit
	{
		$$ = &ast.TLSOption{
			Type:  ast.Subject,
			Value: $2,
		}
	}
|	"CIPHER" stringLit
	{
		$$ = &ast.TLSOption{
			Type:  ast.Cipher,
			Value: $2,
		}
	}
|	"SAN" stringLit
	{
		$$ = &ast.TLSOption{
			Type:  ast.SAN,
			Value: $2,
		}
	}

PasswordOrLockOptions:
	{
		l := []*ast.PasswordOrLockOption{}
		$$ = l
	}
|	PasswordOrLockOptionList
	{
		$$ = $1
		yylex.AppendError(yylex.Errorf("TiDB does not support PASSWORD EXPIRE and ACCOUNT LOCK now, they would be parsed but ignored."))
		parser.lastErrorAsWarn()
	}

PasswordOrLockOptionList:
	PasswordOrLockOption
	{
		$$ = []*ast.PasswordOrLockOption{$1.(*ast.PasswordOrLockOption)}
	}
|	PasswordOrLockOptionList PasswordOrLockOption
	{
		l := $1.([]*ast.PasswordOrLockOption)
		l = append(l, $2.(*ast.PasswordOrLockOption))
		$$ = l
	}

PasswordOrLockOption:
	"ACCOUNT" "UNLOCK"
	{
		$$ = &ast.PasswordOrLockOption{
			Type: ast.Unlock,
		}
	}
|	"ACCOUNT" "LOCK"
	{
		$$ = &ast.PasswordOrLockOption{
			Type: ast.Lock,
		}
	}
|	PasswordExpire
	{
		$$ = &ast.PasswordOrLockOption{
			Type: ast.PasswordExpire,
		}
	}
|	PasswordExpire "INTERVAL" Int64Num "DAY"
	{
		$$ = &ast.PasswordOrLockOption{
			Type:  ast.PasswordExpireInterval,
			Count: $3.(int64),
		}
	}
|	PasswordExpire "NEVER"
	{
		$$ = &ast.PasswordOrLockOption{
			Type: ast.PasswordExpireNever,
		}
	}
|	PasswordExpire "DEFAULT"
	{
		$$ = &ast.PasswordOrLockOption{
			Type: ast.PasswordExpireDefault,
		}
	}

PasswordExpire:
	"PASSWORD" "EXPIRE" ClearPasswordExpireOptions
	{
		$$ = nil
	}

ClearPasswordExpireOptions:
	{
		$$ = nil
	}

AuthOption:
	{
		$$ = nil
	}
|	"IDENTIFIED" "BY" AuthString
	{
		$$ = &ast.AuthOption{
			AuthString:   $3,
			ByAuthString: true,
		}
	}
|	"IDENTIFIED" "WITH" StringName
	{
		$$ = nil
	}
|	"IDENTIFIED" "WITH" StringName "BY" AuthString
	{
		$$ = &ast.AuthOption{
			AuthString:   $5,
			ByAuthString: true,
		}
	}
|	"IDENTIFIED" "WITH" StringName "AS" HashString
	{
		$$ = &ast.AuthOption{
			HashString: $5,
		}
	}
|	"IDENTIFIED" "BY" "PASSWORD" HashString
	{
		$$ = &ast.AuthOption{
			HashString: $4,
		}
	}

HashString:
	stringLit

RoleSpec:
	Rolename
	{
		role := $1.(*auth.RoleIdentity)
		roleSpec := &ast.UserSpec{
			User: &auth.UserIdentity{
				Username: role.Username,
				Hostname: role.Hostname,
			},
			IsRole: true,
		}
		$$ = roleSpec
	}

RoleSpecList:
	RoleSpec
	{
		$$ = []*ast.UserSpec{$1.(*ast.UserSpec)}
	}
|	RoleSpecList ',' RoleSpec
	{
		$$ = append($1.([]*ast.UserSpec), $3.(*ast.UserSpec))
	}

BindableStmt:
	SetOprStmt1
|	UpdateStmt
|	DeleteWithoutUsingStmt
|	InsertIntoStmt
|	ReplaceIntoStmt

/*******************************************************************
 *
 *  Create Binding Statement
 *
 *  Example:
 *      CREATE GLOBAL BINDING FOR select Col1,Col2 from table USING select Col1,Col2 from table use index(Col1)
 *******************************************************************/
CreateBindingStmt:
	"CREATE" GlobalScope "BINDING" "FOR" BindableStmt "USING" BindableStmt
	{
		startOffset := parser.startOffset(&yyS[yypt-2])
		endOffset := parser.startOffset(&yyS[yypt-1])
		originStmt := $5
		originStmt.SetText(strings.TrimSpace(parser.src[startOffset:endOffset]))

		startOffset = parser.startOffset(&yyS[yypt])
		hintedStmt := $7
		hintedStmt.SetText(strings.TrimSpace(parser.src[startOffset:]))

		x := &ast.CreateBindingStmt{
			OriginNode:  originStmt,
			HintedNode:  hintedStmt,
			GlobalScope: $2.(bool),
		}

		$$ = x
	}

/*******************************************************************
 *
 *  Drop Binding Statement
 *
 *  Example:
 *      DROP GLOBAL BINDING FOR select Col1,Col2 from table
 *******************************************************************/
DropBindingStmt:
	"DROP" GlobalScope "BINDING" "FOR" BindableStmt
	{
		startOffset := parser.startOffset(&yyS[yypt])
		originStmt := $5
		originStmt.SetText(strings.TrimSpace(parser.src[startOffset:]))

		x := &ast.DropBindingStmt{
			OriginNode:  originStmt,
			GlobalScope: $2.(bool),
		}

		$$ = x
	}
|	"DROP" GlobalScope "BINDING" "FOR" BindableStmt "USING" BindableStmt
	{
		startOffset := parser.startOffset(&yyS[yypt-2])
		endOffset := parser.startOffset(&yyS[yypt-1])
		originStmt := $5
		originStmt.SetText(strings.TrimSpace(parser.src[startOffset:endOffset]))

		startOffset = parser.startOffset(&yyS[yypt])
		hintedStmt := $7
		hintedStmt.SetText(strings.TrimSpace(parser.src[startOffset:]))

		x := &ast.DropBindingStmt{
			OriginNode:  originStmt,
			HintedNode:  hintedStmt,
			GlobalScope: $2.(bool),
		}

		$$ = x
	}

/*************************************************************************************
 * Grant statement
 * See https://dev.mysql.com/doc/refman/5.7/en/grant.html
 *************************************************************************************/
GrantStmt:
	"GRANT" RoleOrPrivElemList "ON" ObjectType PrivLevel "TO" UserSpecList RequireClauseOpt WithGrantOptionOpt
	{
		p, err := convertToPriv($2.([]*ast.RoleOrPriv))
		if err != nil {
			yylex.AppendError(err)
			return 1
		}
		$$ = &ast.GrantStmt{
			Privs:      p,
			ObjectType: $4.(ast.ObjectTypeType),
			Level:      $5.(*ast.GrantLevel),
			Users:      $7.([]*ast.UserSpec),
			TLSOptions: $8.([]*ast.TLSOption),
			WithGrant:  $9.(bool),
		}
	}

GrantProxyStmt:
	"GRANT" "PROXY" "ON" Username "TO" UsernameList WithGrantOptionOpt
	{
		$$ = &ast.GrantProxyStmt{
			LocalUser:     $4.(*auth.UserIdentity),
			ExternalUsers: $6.([]*auth.UserIdentity),
			WithGrant:     $7.(bool),
		}
	}

GrantRoleStmt:
	"GRANT" RoleOrPrivElemList "TO" UsernameList
	{
		r, err := convertToRole($2.([]*ast.RoleOrPriv))
		if err != nil {
			yylex.AppendError(err)
			return 1
		}
		$$ = &ast.GrantRoleStmt{
			Roles: r,
			Users: $4.([]*auth.UserIdentity),
		}
	}

WithGrantOptionOpt:
	{
		$$ = false
	}
|	"WITH" "GRANT" "OPTION"
	{
		$$ = true
	}
|	"WITH" "MAX_QUERIES_PER_HOUR" NUM
	{
		$$ = false
	}
|	"WITH" "MAX_UPDATES_PER_HOUR" NUM
	{
		$$ = false
	}
|	"WITH" "MAX_CONNECTIONS_PER_HOUR" NUM
	{
		$$ = false
	}
|	"WITH" "MAX_USER_CONNECTIONS" NUM
	{
		$$ = false
	}

ExtendedPriv:
	identifier
	{
		$$ = []string{$1}
	}
|	ExtendedPriv identifier
	{
		$$ = append($1.([]string), $2)
	}

RoleOrPrivElem:
	PrivElem
	{
		$$ = &ast.RoleOrPriv{
			Node: $1,
		}
	}
|	RolenameWithoutIdent
	{
		$$ = &ast.RoleOrPriv{
			Node: $1,
		}
	}
|	ExtendedPriv
	{
		$$ = &ast.RoleOrPriv{
			Symbols: strings.Join($1.([]string), " "),
		}
	}
|	"LOAD" "FROM" "S3"
	{
		$$ = &ast.RoleOrPriv{
			Symbols: "LOAD FROM S3",
		}
	}
|	"SELECT" "INTO" "S3"
	{
		$$ = &ast.RoleOrPriv{
			Symbols: "SELECT INTO S3",
		}
	}

RoleOrPrivElemList:
	RoleOrPrivElem
	{
		$$ = []*ast.RoleOrPriv{$1.(*ast.RoleOrPriv)}
	}
|	RoleOrPrivElemList ',' RoleOrPrivElem
	{
		$$ = append($1.([]*ast.RoleOrPriv), $3.(*ast.RoleOrPriv))
	}

PrivElem:
	PrivType
	{
		$$ = &ast.PrivElem{
			Priv: $1.(mysql.PrivilegeType),
		}
	}
|	PrivType '(' ColumnNameList ')'
	{
		$$ = &ast.PrivElem{
			Priv: $1.(mysql.PrivilegeType),
			Cols: $3.([]*ast.ColumnName),
		}
	}

PrivType:
	"ALL"
	{
		$$ = mysql.AllPriv
	}
|	"ALL" "PRIVILEGES"
	{
		$$ = mysql.AllPriv
	}
|	"ALTER"
	{
		$$ = mysql.AlterPriv
	}
|	"CREATE"
	{
		$$ = mysql.CreatePriv
	}
|	"CREATE" "USER"
	{
		$$ = mysql.CreateUserPriv
	}
|	"CREATE" "TABLESPACE"
	{
		$$ = mysql.CreateTablespacePriv
	}
|	"TRIGGER"
	{
		$$ = mysql.TriggerPriv
	}
|	"DELETE"
	{
		$$ = mysql.DeletePriv
	}
|	"DROP"
	{
		$$ = mysql.DropPriv
	}
|	"PROCESS"
	{
		$$ = mysql.ProcessPriv
	}
|	"EXECUTE"
	{
		$$ = mysql.ExecutePriv
	}
|	"INDEX"
	{
		$$ = mysql.IndexPriv
	}
|	"INSERT"
	{
		$$ = mysql.InsertPriv
	}
|	"SELECT"
	{
		$$ = mysql.SelectPriv
	}
|	"SUPER"
	{
		$$ = mysql.SuperPriv
	}
|	"SHOW" "DATABASES"
	{
		$$ = mysql.ShowDBPriv
	}
|	"UPDATE"
	{
		$$ = mysql.UpdatePriv
	}
|	"GRANT" "OPTION"
	{
		$$ = mysql.GrantPriv
	}
|	"REFERENCES"
	{
		$$ = mysql.ReferencesPriv
	}
|	"REPLICATION" "SLAVE"
	{
		$$ = mysql.ReplicationSlavePriv
	}
|	"REPLICATION" "CLIENT"
	{
		$$ = mysql.ReplicationClientPriv
	}
|	"USAGE"
	{
		$$ = mysql.UsagePriv
	}
|	"RELOAD"
	{
		$$ = mysql.ReloadPriv
	}
|	"FILE"
	{
		$$ = mysql.FilePriv
	}
|	"CONFIG"
	{
		$$ = mysql.ConfigPriv
	}
|	"CREATE" "TEMPORARY" "TABLES"
	{
		$$ = mysql.CreateTMPTablePriv
	}
|	"LOCK" "TABLES"
	{
		$$ = mysql.LockTablesPriv
	}
|	"CREATE" "VIEW"
	{
		$$ = mysql.CreateViewPriv
	}
|	"SHOW" "VIEW"
	{
		$$ = mysql.ShowViewPriv
	}
|	"CREATE" "ROLE"
	{
		$$ = mysql.CreateRolePriv
	}
|	"DROP" "ROLE"
	{
		$$ = mysql.DropRolePriv
	}
|	"CREATE" "ROUTINE"
	{
		$$ = mysql.CreateRoutinePriv
	}
|	"ALTER" "ROUTINE"
	{
		$$ = mysql.AlterRoutinePriv
	}
|	"EVENT"
	{
		$$ = mysql.EventPriv
	}
|	"SHUTDOWN"
	{
		$$ = mysql.ShutdownPriv
	}

ObjectType:
	%prec lowerThanFunction
	{
		$$ = ast.ObjectTypeNone
	}
|	"TABLE"
	{
		$$ = ast.ObjectTypeTable
	}
|	"FUNCTION"
	{
		$$ = ast.ObjectTypeFunction
	}
|	"PROCEDURE"
	{
		$$ = ast.ObjectTypeProcedure
	}

PrivLevel:
	'*'
	{
		$$ = &ast.GrantLevel{
			Level: ast.GrantLevelDB,
		}
	}
|	'*' '.' '*'
	{
		$$ = &ast.GrantLevel{
			Level: ast.GrantLevelGlobal,
		}
	}
|	Identifier '.' '*'
	{
		$$ = &ast.GrantLevel{
			Level:  ast.GrantLevelDB,
			DBName: $1,
		}
	}
|	Identifier '.' Identifier
	{
		$$ = &ast.GrantLevel{
			Level:     ast.GrantLevelTable,
			DBName:    $1,
			TableName: $3,
		}
	}
|	Identifier
	{
		$$ = &ast.GrantLevel{
			Level:     ast.GrantLevelTable,
			TableName: $1,
		}
	}

/**************************************RevokeStmt*******************************************
 * See https://dev.mysql.com/doc/refman/5.7/en/revoke.html
 *******************************************************************************************/
RevokeStmt:
	"REVOKE" RoleOrPrivElemList "ON" ObjectType PrivLevel "FROM" UserSpecList
	{
		p, err := convertToPriv($2.([]*ast.RoleOrPriv))
		if err != nil {
			yylex.AppendError(err)
			return 1
		}
		$$ = &ast.RevokeStmt{
			Privs:      p,
			ObjectType: $4.(ast.ObjectTypeType),
			Level:      $5.(*ast.GrantLevel),
			Users:      $7.([]*ast.UserSpec),
		}
	}

RevokeRoleStmt:
	"REVOKE" RoleOrPrivElemList "FROM" UsernameList
	{
		r, err := convertToRole($2.([]*ast.RoleOrPriv))
		if err != nil {
			yylex.AppendError(err)
			return 1
		}
		$$ = &ast.RevokeRoleStmt{
			Roles: r,
			Users: $4.([]*auth.UserIdentity),
		}
	}

/**************************************LoadDataStmt*****************************************
 * See https://dev.mysql.com/doc/refman/5.7/en/load-data.html
 *******************************************************************************************/
LoadDataStmt:
	"LOAD" "DATA" LocalOpt "INFILE" stringLit DuplicateOpt "INTO" "TABLE" TableName CharsetOpt Fields Lines IgnoreLines ColumnNameOrUserVarListOptWithBrackets LoadDataSetSpecOpt
	{
		x := &ast.LoadDataStmt{
			Path:               $5,
			OnDuplicate:        $6.(ast.OnDuplicateKeyHandlingType),
			Table:              $9.(*ast.TableName),
			ColumnsAndUserVars: $14.([]*ast.ColumnNameOrUserVar),
			IgnoreLines:        $13.(uint64),
		}
		if $3 != nil {
			x.IsLocal = true
			// See https://dev.mysql.com/doc/refman/5.7/en/load-data.html#load-data-duplicate-key-handling
			// If you do not specify IGNORE or REPLACE modifier , then we set default behavior to IGNORE when LOCAL modifier is specified
			if x.OnDuplicate == ast.OnDuplicateKeyHandlingError {
				x.OnDuplicate = ast.OnDuplicateKeyHandlingIgnore
			}
		}
		if $11 != nil {
			x.FieldsInfo = $11.(*ast.FieldsClause)
		}
		if $12 != nil {
			x.LinesInfo = $12.(*ast.LinesClause)
		}
		if $15 != nil {
			x.ColumnAssignments = $15.([]*ast.Assignment)
		}
		columns := []*ast.ColumnName{}
		for _, v := range x.ColumnsAndUserVars {
			if v.ColumnName != nil {
				columns = append(columns, v.ColumnName)
			}
		}
		x.Columns = columns

		$$ = x
	}

IgnoreLines:
	{
		$$ = uint64(0)
	}
|	"IGNORE" NUM "LINES"
	{
		$$ = getUint64FromNUM($2)
	}

CharsetOpt:
	{}
|	"CHARACTER" "SET" CharsetName

LocalOpt:
	{
		$$ = nil
	}
|	"LOCAL"
	{
		$$ = $1
	}

Fields:
	{
		escape := "\\"
		$$ = &ast.FieldsClause{
			Terminated: "\t",
			Escaped:    escape[0],
		}
	}
|	FieldsOrColumns FieldItemList
	{
		fieldsClause := &ast.FieldsClause{
			Terminated: "\t",
			Escaped:    []byte("\\")[0],
		}
		fieldItems := $2.([]*ast.FieldItem)
		for _, item := range fieldItems {
			switch item.Type {
			case ast.Terminated:
				fieldsClause.Terminated = item.Value
			case ast.Enclosed:
				var enclosed byte
				if len(item.Value) > 0 {
					enclosed = item.Value[0]
				}
				fieldsClause.Enclosed = enclosed
				if item.OptEnclosed {
					fieldsClause.OptEnclosed = true
				}
			case ast.Escaped:
				var escaped byte
				if len(item.Value) > 0 {
					escaped = item.Value[0]
				}
				fieldsClause.Escaped = escaped
			}
		}
		$$ = fieldsClause
	}

FieldsOrColumns:
	"FIELDS"
|	"COLUMNS"

FieldItemList:
	FieldItemList FieldItem
	{
		fieldItems := $1.([]*ast.FieldItem)
		$$ = append(fieldItems, $2.(*ast.FieldItem))
	}
|	FieldItem
	{
		fieldItems := make([]*ast.FieldItem, 1, 1)
		fieldItems[0] = $1.(*ast.FieldItem)
		$$ = fieldItems
	}

FieldItem:
	"TERMINATED" "BY" FieldTerminator
	{
		$$ = &ast.FieldItem{
			Type:  ast.Terminated,
			Value: $3,
		}
	}
|	"OPTIONALLY" "ENCLOSED" "BY" FieldTerminator
	{
		str := $4
		if str != "\\" && len(str) > 1 {
			yylex.AppendError(ErrWrongFieldTerminators.GenWithStackByArgs())
			return 1
		}
		$$ = &ast.FieldItem{
			Type:        ast.Enclosed,
			Value:       str,
			OptEnclosed: true,
		}
	}
|	"ENCLOSED" "BY" FieldTerminator
	{
		str := $3
		if str != "\\" && len(str) > 1 {
			yylex.AppendError(ErrWrongFieldTerminators.GenWithStackByArgs())
			return 1
		}
		$$ = &ast.FieldItem{
			Type:  ast.Enclosed,
			Value: str,
		}
	}
|	"ESCAPED" "BY" FieldTerminator
	{
		str := $3
		if str != "\\" && len(str) > 1 {
			yylex.AppendError(ErrWrongFieldTerminators.GenWithStackByArgs())
			return 1
		}
		$$ = &ast.FieldItem{
			Type:  ast.Escaped,
			Value: str,
		}
	}

FieldTerminator:
	stringLit
|	hexLit
	{
		$$ = $1.(ast.BinaryLiteral).ToString()
	}
|	bitLit
	{
		$$ = $1.(ast.BinaryLiteral).ToString()
	}

Lines:
	{
		$$ = &ast.LinesClause{Terminated: "\n"}
	}
|	"LINES" Starting LinesTerminated
	{
		$$ = &ast.LinesClause{Starting: $2, Terminated: $3}
	}

Starting:
	{
		$$ = ""
	}
|	"STARTING" "BY" stringLit
	{
		$$ = $3
	}

LinesTerminated:
	{
		$$ = "\n"
	}
|	"TERMINATED" "BY" stringLit
	{
		$$ = $3
	}

LoadDataSetSpecOpt:
	{
		$$ = nil
	}
|	"SET" LoadDataSetList
	{
		$$ = $2
	}

LoadDataSetList:
	LoadDataSetList ',' LoadDataSetItem
	{
		l := $1.([]*ast.Assignment)
		$$ = append(l, $3.(*ast.Assignment))
	}
|	LoadDataSetItem
	{
		$$ = []*ast.Assignment{$1.(*ast.Assignment)}
	}

LoadDataSetItem:
	SimpleIdent "=" ExprOrDefault
	{
		$$ = &ast.Assignment{
			Column: $1.(*ast.ColumnNameExpr).Name,
			Expr:   $3,
		}
	}

/*********************************************************************
 * Lock/Unlock Tables
 * See http://dev.mysql.com/doc/refman/5.7/en/lock-tables.html
 * All the statement leaves empty. This is used to prevent mysqldump error.
 *********************************************************************/
UnlockTablesStmt:
	"UNLOCK" TablesTerminalSym
	{
		$$ = &ast.UnlockTablesStmt{}
	}

LockTablesStmt:
	"LOCK" TablesTerminalSym TableLockList
	{
		$$ = &ast.LockTablesStmt{
			TableLocks: $3.([]ast.TableLock),
		}
	}

TablesTerminalSym:
	"TABLES"
|	"TABLE"

TableLock:
	TableName LockType
	{
		$$ = ast.TableLock{
			Table: $1.(*ast.TableName),
			Type:  $2.(model.TableLockType),
		}
	}

LockType:
	"READ"
	{
		$$ = model.TableLockRead
	}
|	"READ" "LOCAL"
	{
		$$ = model.TableLockReadLocal
	}
|	"WRITE"
	{
		$$ = model.TableLockWrite
	}
|	"WRITE" "LOCAL"
	{
		$$ = model.TableLockWriteLocal
	}

TableLockList:
	TableLock
	{
		$$ = []ast.TableLock{$1.(ast.TableLock)}
	}
|	TableLockList ',' TableLock
	{
		$$ = append($1.([]ast.TableLock), $3.(ast.TableLock))
	}

/********************************************************************
 * Kill Statement
 * See https://dev.mysql.com/doc/refman/5.7/en/kill.html
 *******************************************************************/
KillStmt:
	KillOrKillTiDB NUM
	{
		$$ = &ast.KillStmt{
			ConnectionID:  getUint64FromNUM($2),
			TiDBExtension: $1.(bool),
		}
	}
|	KillOrKillTiDB "CONNECTION" NUM
	{
		$$ = &ast.KillStmt{
			ConnectionID:  getUint64FromNUM($3),
			TiDBExtension: $1.(bool),
		}
	}
|	KillOrKillTiDB "QUERY" NUM
	{
		$$ = &ast.KillStmt{
			ConnectionID:  getUint64FromNUM($3),
			Query:         true,
			TiDBExtension: $1.(bool),
		}
	}

KillOrKillTiDB:
	"KILL"
	{
		$$ = false
	}
/* KILL TIDB is a special grammar extension in TiDB, it can be used only when
   the client connect to TiDB directly, not proxied under LVS. */
|	"KILL" "TIDB"
	{
		$$ = true
	}

LoadStatsStmt:
	"LOAD" "STATS" stringLit
	{
		$$ = &ast.LoadStatsStmt{
			Path: $3,
		}
	}

/********************************************************************************************
 *
 *  Create Sequence Statement
 *
 *  Example:
 *	CREATE [TEMPORARY] SEQUENCE [IF NOT EXISTS] sequence_name
 *	[ INCREMENT [ BY | = ] increment ]
 *	[ MINVALUE [=] minvalue | NO MINVALUE | NOMINVALUE ]
 *	[ MAXVALUE [=] maxvalue | NO MAXVALUE | NOMAXVALUE ]
 *	[ START [ WITH | = ] start ]
 *	[ CACHE [=] cache | NOCACHE | NO CACHE]
 *	[ CYCLE | NOCYCLE | NO CYCLE]
 *	[table_options]
 ********************************************************************************************/
CreateSequenceStmt:
	"CREATE" "SEQUENCE" IfNotExists TableName CreateSequenceOptionListOpt CreateTableOptionListOpt
	{
		$$ = &ast.CreateSequenceStmt{
			IfNotExists: $3.(bool),
			Name:        $4.(*ast.TableName),
			SeqOptions:  $5.([]*ast.SequenceOption),
			TblOptions:  $6.([]*ast.TableOption),
		}
	}

CreateSequenceOptionListOpt:
	{
		$$ = []*ast.SequenceOption{}
	}
|	SequenceOptionList

SequenceOptionList:
	SequenceOption
	{
		$$ = []*ast.SequenceOption{$1.(*ast.SequenceOption)}
	}
|	SequenceOptionList SequenceOption
	{
		$$ = append($1.([]*ast.SequenceOption), $2.(*ast.SequenceOption))
	}

SequenceOption:
	"INCREMENT" EqOpt SignedNum
	{
		$$ = &ast.SequenceOption{Tp: ast.SequenceOptionIncrementBy, IntValue: $3.(int64)}
	}
|	"INCREMENT" "BY" SignedNum
	{
		$$ = &ast.SequenceOption{Tp: ast.SequenceOptionIncrementBy, IntValue: $3.(int64)}
	}
|	"START" EqOpt SignedNum
	{
		$$ = &ast.SequenceOption{Tp: ast.SequenceStartWith, IntValue: $3.(int64)}
	}
|	"START" "WITH" SignedNum
	{
		$$ = &ast.SequenceOption{Tp: ast.SequenceStartWith, IntValue: $3.(int64)}
	}
|	"MINVALUE" EqOpt SignedNum
	{
		$$ = &ast.SequenceOption{Tp: ast.SequenceMinValue, IntValue: $3.(int64)}
	}
|	"NOMINVALUE"
	{
		$$ = &ast.SequenceOption{Tp: ast.SequenceNoMinValue}
	}
|	"NO" "MINVALUE"
	{
		$$ = &ast.SequenceOption{Tp: ast.SequenceNoMinValue}
	}
|	"MAXVALUE" EqOpt SignedNum
	{
		$$ = &ast.SequenceOption{Tp: ast.SequenceMaxValue, IntValue: $3.(int64)}
	}
|	"NOMAXVALUE"
	{
		$$ = &ast.SequenceOption{Tp: ast.SequenceNoMaxValue}
	}
|	"NO" "MAXVALUE"
	{
		$$ = &ast.SequenceOption{Tp: ast.SequenceNoMaxValue}
	}
|	"CACHE" EqOpt SignedNum
	{
		$$ = &ast.SequenceOption{Tp: ast.SequenceCache, IntValue: $3.(int64)}
	}
|	"NOCACHE"
	{
		$$ = &ast.SequenceOption{Tp: ast.SequenceNoCache}
	}
|	"NO" "CACHE"
	{
		$$ = &ast.SequenceOption{Tp: ast.SequenceNoCache}
	}
|	"CYCLE"
	{
		$$ = &ast.SequenceOption{Tp: ast.SequenceCycle}
	}
|	"NOCYCLE"
	{
		$$ = &ast.SequenceOption{Tp: ast.SequenceNoCycle}
	}
|	"NO" "CYCLE"
	{
		$$ = &ast.SequenceOption{Tp: ast.SequenceNoCycle}
	}

SignedNum:
	Int64Num
|	'+' Int64Num
	{
		$$ = $2
	}
|	'-' NUM
	{
		unsigned_num := getUint64FromNUM($2)
		if unsigned_num > 9223372036854775808 {
			yylex.AppendError(yylex.Errorf("the Signed Value should be at the range of [-9223372036854775808, 9223372036854775807]."))
			return 1
		} else if unsigned_num == 9223372036854775808 {
			signed_one := int64(1)
			$$ = signed_one << 63
		} else {
			$$ = -int64(unsigned_num)
		}
	}

DropSequenceStmt:
	"DROP" "SEQUENCE" IfExists TableNameList
	{
		$$ = &ast.DropSequenceStmt{
			IfExists:  $3.(bool),
			Sequences: $4.([]*ast.TableName),
		}
	}

/********************************************************************************************
 *
 *  Alter Sequence Statement
 *
 *  Example:
 *	ALTER SEQUENCE [IF EXISTS] sequence_name
 *	[ INCREMENT [ BY | = ] increment ]
 *	[ MINVALUE [=] minvalue | NO MINVALUE | NOMINVALUE ]
 *	[ MAXVALUE [=] maxvalue | NO MAXVALUE | NOMAXVALUE ]
 *	[ START [ WITH | = ] start ]
 *	[ CACHE [=] cache | NOCACHE | NO CACHE]
 *	[ CYCLE | NOCYCLE | NO CYCLE]
 *	[ RESTART [WITH | = ] restart ]
 ********************************************************************************************/
AlterSequenceStmt:
	"ALTER" "SEQUENCE" IfExists TableName AlterSequenceOptionList
	{
		$$ = &ast.AlterSequenceStmt{
			IfExists:   $3.(bool),
			Name:       $4.(*ast.TableName),
			SeqOptions: $5.([]*ast.SequenceOption),
		}
	}

AlterSequenceOptionList:
	AlterSequenceOption
	{
		$$ = []*ast.SequenceOption{$1.(*ast.SequenceOption)}
	}
|	AlterSequenceOptionList AlterSequenceOption
	{
		$$ = append($1.([]*ast.SequenceOption), $2.(*ast.SequenceOption))
	}

AlterSequenceOption:
	SequenceOption
|	"RESTART"
	{
		$$ = &ast.SequenceOption{Tp: ast.SequenceRestart}
	}
|	"RESTART" EqOpt SignedNum
	{
		$$ = &ast.SequenceOption{Tp: ast.SequenceRestartWith, IntValue: $3.(int64)}
	}
|	"RESTART" "WITH" SignedNum
	{
		$$ = &ast.SequenceOption{Tp: ast.SequenceRestartWith, IntValue: $3.(int64)}
	}

/********************************************************************
 * Index Advisor Statement
 *
 * INDEX ADVISE
 * 	[LOCAL]
 *	INFILE 'file_name'
 *	[MAX_MINUTES number]
 *	[MAX_IDXNUM
 *  	[PER_TABLE number]
 *  	[PER_DB number]
 *	]
 *	[LINES
 *  	[STARTING BY 'string']
 *  	[TERMINATED BY 'string']
 *	]
 *******************************************************************/
IndexAdviseStmt:
	"INDEX" "ADVISE" LocalOpt "INFILE" stringLit MaxMinutesOpt MaxIndexNumOpt Lines
	{
		x := &ast.IndexAdviseStmt{
			Path:       $5,
			MaxMinutes: $6.(uint64),
		}
		if $3 != nil {
			x.IsLocal = true
		}
		if $7 != nil {
			x.MaxIndexNum = $7.(*ast.MaxIndexNumClause)
		}
		if $8 != nil {
			x.LinesInfo = $8.(*ast.LinesClause)
		}
		$$ = x
	}

MaxMinutesOpt:
	{
		$$ = uint64(ast.UnspecifiedSize)
	}
|	"MAX_MINUTES" NUM
	{
		$$ = getUint64FromNUM($2)
	}

MaxIndexNumOpt:
	{
		$$ = nil
	}
|	"MAX_IDXNUM" PerTable PerDB
	{
		$$ = &ast.MaxIndexNumClause{
			PerTable: $2.(uint64),
			PerDB:    $3.(uint64),
		}
	}

PerTable:
	{
		$$ = uint64(ast.UnspecifiedSize)
	}
|	"PER_TABLE" NUM
	{
		$$ = getUint64FromNUM($2)
	}

PerDB:
	{
		$$ = uint64(ast.UnspecifiedSize)
	}
|	"PER_DB" NUM
	{
		$$ = getUint64FromNUM($2)
	}

EncryptionOpt:
	stringLit
	{
		// Parse it but will ignore it
		switch $1 {
		case "Y", "y":
			yylex.AppendError(yylex.Errorf("The ENCRYPTION clause is parsed but ignored by all storage engines."))
			parser.lastErrorAsWarn()
		case "N", "n":
			break
		default:
			yylex.AppendError(ErrWrongValue.GenWithStackByArgs("argument (should be Y or N)", $1))
			return 1
		}
		$$ = $1
	}

ValuesStmtList:
	RowStmt
	{
		$$ = append([]*ast.RowExpr{}, $1.(*ast.RowExpr))
	}
|	ValuesStmtList ',' RowStmt
	{
		$$ = append($1.([]*ast.RowExpr), $3.(*ast.RowExpr))
	}

RowStmt:
	"ROW" RowValue
	{
		$$ = &ast.RowExpr{Values: $2.([]ast.ExprNode)}
	}
%%