feat: handle additional pseudocolumn types in bigquery when resolving external table schemas

Author: z3z1ma

sqlmesh/core/engine_adapter/bigquery.py

@@ -324,14 +324,26 @@ def create_mapping_schema(
             bq_table = self._get_table(table)
             columns = create_mapping_schema(bq_table.schema)
 
-            if (
-                include_pseudo_columns
-                and bq_table.time_partitioning
-                and not bq_table.time_partitioning.field
-            ):
-                columns["_PARTITIONTIME"] = exp.DataType.build("TIMESTAMP", dialect="bigquery")
-                if bq_table.time_partitioning.type_ == "DAY":
-                    columns["_PARTITIONDATE"] = exp.DataType.build("DATE")
+            if include_pseudo_columns:
+                if bq_table.time_partitioning and not bq_table.time_partitioning.field:
+                    columns["_PARTITIONTIME"] = exp.DataType.build("TIMESTAMP", dialect="bigquery")
+                    if bq_table.time_partitioning.type_ == "DAY":
+                        columns["_PARTITIONDATE"] = exp.DataType.build("DATE")
+                if bq_table.table_id.endswith("*"):
+                    columns["_TABLE_SUFFIX"] = exp.DataType.build("STRING", dialect="bigquery")
+                if (
+                    bq_table.external_data_configuration is not None
+                    and bq_table.external_data_configuration.source_format
+                    in (
+                        "CSV",
+                        "NEWLINE_DELIMITED_JSON",
+                        "AVRO",
+                        "PARQUET",
+                        "ORC",
+                        "DATASTORE_BACKUP",
+                    )
+                ):
+                    columns["_FILE_NAME"] = exp.DataType.build("STRING", dialect="bigquery")
 
         return columns