Support parameters in postgres_query#377
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This PR adds parameters support to `postgres_query()` function.
Parameters are only supported when using the Postgres text protocol.
Parameters are specified as a `STRUCT`, that can be created inline using
`row()` function:
```sql
SET pg_use_text_protocol=true
SELECT * FROM postgres_query('s1', 'SELECT $1::INTEGER, $2::TEXT', params=row(42, 'foo'))
----
42 foo
```
When the whole DuckDB SQL statement, that contains `postgres_query()`
function, is used with `PREPARE` + `EXECUTE` (for example, from Python
or Java client), then the external client-provided parameters will be
forwarded to SQLite:
```sql
PREPARE p1 AS SELECT * FROM postgres_query('s1', 'SELECT $1::INTEGER, $2::TEXT', params=row(?::INTEGER, ?::VARCHAR))
EXECUTE p1(42, 'foo')
----
42 foo
EXECUTE p1(43, 'bar')
----
43 bar
DEALLOCATE p1
```
Parameters of integer and floating-point types can be specified using
corresponding DuckDB types and are passed in binary form. All other
parameter types nees to be passed as `VARCHAR`.
Testing: new test added.
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This PR adds parameters support to
postgres_query()function. Parameters are only supported when using the Postgres text protocol.Parameters are specified as a
STRUCT, that can be created inline usingrow()function:When the whole DuckDB SQL statement, that contains
postgres_query()function, is used withPREPARE+EXECUTE(for example, from Python or Java client), then the external client-provided parameters will be forwarded to SQLite:Parameters of integer and floating-point types can be specified using corresponding DuckDB types and are passed in binary form. All other parameter types nees to be passed as
VARCHAR.Testing: new test added.