fix(sqlalchemy-bigquery): Support Creation of JSON columns (#16733)

Fixes#15761

Author: waltaskew

packages/sqlalchemy-bigquery/sqlalchemy_bigquery/base.py

@@ -622,6 +622,9 @@ def visit_BINARY(self, type_, **kw):
 
 visit_VARBINARY=visit_BLOB=visit_BINARY
 
+defvisit_JSON(self, type_, **kw):
+return"JSON"
+
 defvisit_NUMERIC(self, type_, **kw):
 if (type_.precisionisnotNone) andisinstance(
 kw.get("type_expression"), Column

packages/sqlalchemy-bigquery/tests/unit/test_table_options.py

@@ -62,6 +62,18 @@ def test_table_default_rounding_mode_dialect_option(faux_conn):
  )
 
 
+deftest_table_with_json_columns(faux_conn):
+setup_table(
+faux_conn,
+"some_table",
+sqlalchemy.Column("some_stuff", sqlalchemy.JSON),
+ )
+
+assert" ".join(faux_conn.test_data["execute"][-1][0].strip().split()) == (
+"CREATE TABLE `some_table` ( `some_stuff` JSON )"
+ )
+
+
 deftest_table_clustering_fields_dialect_option_no_such_column(faux_conn):
 withpytest.raises(sqlalchemy.exc.NoSuchColumnError):
 setup_table(