import time import unittest from unittest.mock import patch from sqlglot import Parser, exp, parse, parse_one from sqlglot.errors import ErrorLevel, ParseError from tests.helpers import assert_logger_contains class TestParser(unittest.TestCase): def test_parse_empty(self): with self.assertRaises(ParseError) as ctx: parse_one("") def test_parse_into(self): self.assertIsInstance(parse_one("left join foo", into=exp.Join), exp.Join) self.assertIsInstance(parse_one("int", into=exp.DataType), exp.DataType) self.assertIsInstance(parse_one("array", into=exp.DataType), exp.DataType) self.assertIsInstance(parse_one("foo", into=exp.Table), exp.Table) with self.assertRaises(ParseError) as ctx: parse_one("SELECT * FROM tbl", into=exp.Table) self.assertEqual( str(ctx.exception), "Failed to parse 'SELECT * FROM tbl' into ", ) def test_parse_into_error(self): expected_message = "Failed to parse 'SELECT 1;' into []" expected_errors = [ { "description": "Invalid expression / Unexpected token", "line": 1, "col": 6, "start_context": "", "highlight": "SELECT", "end_context": " 1;", "into_expression": exp.From, } ] with self.assertRaises(ParseError) as ctx: parse_one("SELECT 1;", read="sqlite", into=[exp.From]) self.assertEqual(str(ctx.exception), expected_message) self.assertEqual(ctx.exception.errors, expected_errors) def test_parse_into_errors(self): expected_message = "Failed to parse 'SELECT 1;' into [, ]" expected_errors = [ { "description": "Invalid expression / Unexpected token", "line": 1, "col": 6, "start_context": "", "highlight": "SELECT", "end_context": " 1;", "into_expression": exp.From, }, { "description": "Invalid expression / Unexpected token", "line": 1, "col": 6, "start_context": "", "highlight": "SELECT", "end_context": " 1;", "into_expression": exp.Join, }, ] with self.assertRaises(ParseError) as ctx: parse_one("SELECT 1;", "sqlite", into=[exp.From, exp.Join]) self.assertEqual(str(ctx.exception), expected_message) self.assertEqual(ctx.exception.errors, expected_errors) def test_column(self): columns = parse_one("select a, ARRAY[1] b, case when 1 then 1 end").find_all(exp.Column) assert len(list(columns)) == 1 self.assertIsNotNone(parse_one("date").find(exp.Column)) def test_float(self): self.assertEqual(parse_one(".2"), parse_one("0.2")) def test_unnest_projection(self): expr = parse_one("SELECT foo IN UNNEST(bla) AS bar") self.assertIsInstance(expr.selects[0], exp.Alias) self.assertEqual(expr.selects[0].output_name, "bar") def test_unary_plus(self): self.assertEqual(parse_one("+15"), exp.Literal.number(15)) def test_table(self): tables = [t.sql() for t in parse_one("select * from a, b.c, .d").find_all(exp.Table)] self.assertEqual(set(tables), {"a", "b.c", "d"}) def test_union_order(self): self.assertIsInstance(parse_one("SELECT * FROM (SELECT 1) UNION SELECT 2"), exp.Union) self.assertIsInstance( parse_one("SELECT x FROM y HAVING x > (SELECT 1) UNION SELECT 2"), exp.Union ) def test_select(self): self.assertIsNotNone(parse_one("select 1 natural")) self.assertIsNotNone(parse_one("select * from (select 1) x order by x.y").args["order"]) self.assertIsNotNone( parse_one("select * from x where a = (select 1) order by x.y").args["order"] ) self.assertEqual(len(parse_one("select * from (select 1) x cross join y").args["joins"]), 1) self.assertEqual( parse_one("""SELECT * FROM x CROSS JOIN y, z LATERAL VIEW EXPLODE(y)""").sql(), """SELECT * FROM x CROSS JOIN y, z LATERAL VIEW EXPLODE(y)""", ) self.assertIsNone( parse_one("create table a as (select b from c) index").find(exp.TableAlias) ) def test_command(self): expressions = parse("SET x = 1; ADD JAR s3://a; SELECT 1", read="hive") self.assertEqual(len(expressions), 3) self.assertEqual(expressions[0].sql(), "SET x = 1") self.assertEqual(expressions[1].sql(), "ADD JAR s3://a") self.assertEqual(expressions[2].sql(), "SELECT 1") def test_lambda_struct(self): expression = parse_one("FILTER(a.b, x -> x.id = id)") lambda_expr = expression.expression self.assertIsInstance(lambda_expr.this.this, exp.Dot) self.assertEqual(lambda_expr.sql(), "x -> x.id = id") self.assertIsNone(parse_one("FILTER([], x -> x)").find(exp.Column)) def test_transactions(self): expression = parse_one("BEGIN TRANSACTION") self.assertIsNone(expression.this) self.assertEqual(expression.args["modes"], []) self.assertEqual(expression.sql(), "BEGIN") expression = parse_one("START TRANSACTION", read="mysql") self.assertIsNone(expression.this) self.assertEqual(expression.args["modes"], []) self.assertEqual(expression.sql(), "BEGIN") expression = parse_one("BEGIN DEFERRED TRANSACTION") self.assertEqual(expression.this, "DEFERRED") self.assertEqual(expression.args["modes"], []) self.assertEqual(expression.sql(), "BEGIN") expression = parse_one( "START TRANSACTION READ WRITE, ISOLATION LEVEL SERIALIZABLE", read="presto" ) self.assertIsNone(expression.this) self.assertEqual(expression.args["modes"][0], "READ WRITE") self.assertEqual(expression.args["modes"][1], "ISOLATION LEVEL SERIALIZABLE") self.assertEqual(expression.sql(), "BEGIN") expression = parse_one("BEGIN", read="bigquery") self.assertNotIsInstance(expression, exp.Transaction) self.assertIsNone(expression.expression) self.assertEqual(expression.sql(), "BEGIN") def test_identify(self): expression = parse_one( """ SELECT a, "b", c AS c, d AS "D", e AS "y|z'" FROM y."z" """ ) assert expression.expressions[0].name == "a" assert expression.expressions[1].name == "b" assert expression.expressions[2].alias == "c" assert expression.expressions[3].alias == "D" assert expression.expressions[4].alias == "y|z'" table = expression.args["from"].this assert table.name == "z" assert table.args["db"].name == "y" def test_multi(self): expressions = parse( """ SELECT * FROM a; SELECT * FROM b; """ ) assert len(expressions) == 2 assert expressions[0].args["from"].name == "a" assert expressions[1].args["from"].name == "b" expressions = parse("SELECT 1; ; SELECT 2") assert len(expressions) == 3 assert expressions[1] is None def test_expression(self): ignore = Parser(error_level=ErrorLevel.IGNORE) self.assertIsInstance(ignore.expression(exp.Hint, expressions=[""]), exp.Hint) self.assertIsInstance(ignore.expression(exp.Hint, y=""), exp.Hint) self.assertIsInstance(ignore.expression(exp.Hint), exp.Hint) default = Parser(error_level=ErrorLevel.RAISE) self.assertIsInstance(default.expression(exp.Hint, expressions=[""]), exp.Hint) default.expression(exp.Hint, y="") default.expression(exp.Hint) self.assertEqual(len(default.errors), 3) warn = Parser(error_level=ErrorLevel.WARN) warn.expression(exp.Hint, y="") self.assertEqual(len(warn.errors), 2) def test_parse_errors(self): with self.assertRaises(ParseError): parse_one("IF(a > 0, a, b, c)") with self.assertRaises(ParseError): parse_one("IF(a > 0)") with self.assertRaises(ParseError): parse_one("SELECT CASE FROM x") with self.assertRaises(ParseError): parse_one("WITH cte AS (SELECT * FROM x)") with self.assertRaises(ParseError): parse_one("SELECT foo( FROM bar") self.assertEqual( parse_one( "CREATE TABLE t (i UInt8) ENGINE = AggregatingMergeTree() ORDER BY tuple()", read="clickhouse", error_level=ErrorLevel.RAISE, ).sql(dialect="clickhouse"), "CREATE TABLE t (i UInt8) ENGINE=AggregatingMergeTree() ORDER BY tuple()", ) def test_space(self): self.assertEqual( parse_one("SELECT ROW() OVER(PARTITION BY x) FROM x GROUP BY y").sql(), "SELECT ROW() OVER (PARTITION BY x) FROM x GROUP BY y", ) self.assertEqual( parse_one( """SELECT * FROM x GROUP BY y""" ).sql(), "SELECT * FROM x GROUP BY y", ) def test_missing_by(self): with self.assertRaises(ParseError): parse_one("SELECT FROM x ORDER BY") def test_parameter(self): self.assertEqual(parse_one("SELECT @x, @@x, @1").sql(), "SELECT @x, @@x, @1") def test_var(self): self.assertIsInstance(parse_one("INTERVAL '1' DAY").args["unit"], exp.Var) self.assertEqual(parse_one("SELECT @JOIN, @'foo'").sql(), "SELECT @JOIN, @'foo'") def test_comments_select(self): expression = parse_one( """ --comment1.1 --comment1.2 SELECT /*comment1.3*/ a, --comment2 b as B, --comment3:testing "test--annotation", c, --comment4 --foo e, -- f -- space FROM foo """ ) self.assertEqual(expression.comments, ["comment1.1", "comment1.2", "comment1.3"]) self.assertEqual(expression.expressions[0].comments, ["comment2"]) self.assertEqual(expression.expressions[1].comments, ["comment3:testing"]) self.assertEqual(expression.expressions[2].comments, None) self.assertEqual(expression.expressions[3].comments, ["comment4 --foo"]) self.assertEqual(expression.expressions[4].comments, [""]) self.assertEqual(expression.expressions[5].comments, [" space"]) def test_comments_select_cte(self): expression = parse_one( """ /*comment1.1*/ /*comment1.2*/ WITH a AS (SELECT 1) SELECT /*comment2*/ a.* FROM /*comment3*/ a """ ) self.assertEqual(expression.comments, ["comment2"]) self.assertEqual(expression.args.get("from").comments, ["comment3"]) self.assertEqual(expression.args.get("with").comments, ["comment1.1", "comment1.2"]) def test_comments_insert(self): expression = parse_one( """ --comment1.1 --comment1.2 INSERT INTO /*comment1.3*/ x /*comment2*/ VALUES /*comment3*/ (1, 'a', 2.0) """ ) self.assertEqual(expression.comments, ["comment1.1", "comment1.2", "comment1.3"]) self.assertEqual(expression.this.comments, ["comment2"]) def test_comments_insert_cte(self): expression = parse_one( """ /*comment1.1*/ /*comment1.2*/ WITH a AS (SELECT 1) INSERT INTO /*comment2*/ b /*comment3*/ SELECT * FROM a """ ) self.assertEqual(expression.comments, ["comment2"]) self.assertEqual(expression.this.comments, ["comment3"]) self.assertEqual(expression.args.get("with").comments, ["comment1.1", "comment1.2"]) def test_comments_update(self): expression = parse_one( """ --comment1.1 --comment1.2 UPDATE /*comment1.3*/ tbl /*comment2*/ SET /*comment3*/ x = 2 WHERE /*comment4*/ x <> 2 """ ) self.assertEqual(expression.comments, ["comment1.1", "comment1.2", "comment1.3"]) self.assertEqual(expression.this.comments, ["comment2"]) self.assertEqual(expression.args.get("where").comments, ["comment4"]) def test_comments_update_cte(self): expression = parse_one( """ /*comment1.1*/ /*comment1.2*/ WITH a AS (SELECT * FROM b) UPDATE /*comment2*/ a /*comment3*/ SET col = 1 """ ) self.assertEqual(expression.comments, ["comment2"]) self.assertEqual(expression.this.comments, ["comment3"]) self.assertEqual(expression.args.get("with").comments, ["comment1.1", "comment1.2"]) def test_comments_delete(self): expression = parse_one( """ --comment1.1 --comment1.2 DELETE /*comment1.3*/ FROM /*comment2*/ x /*comment3*/ WHERE /*comment4*/ y > 1 """ ) self.assertEqual(expression.comments, ["comment1.1", "comment1.2", "comment1.3"]) self.assertEqual(expression.this.comments, ["comment3"]) self.assertEqual(expression.args.get("where").comments, ["comment4"]) def test_comments_delete_cte(self): expression = parse_one( """ /*comment1.1*/ /*comment1.2*/ WITH a AS (SELECT * FROM b) --comment2 DELETE FROM a /*comment3*/ """ ) self.assertEqual(expression.comments, ["comment2"]) self.assertEqual(expression.this.comments, ["comment3"]) self.assertEqual(expression.args.get("with").comments, ["comment1.1", "comment1.2"]) def test_type_literals(self): self.assertEqual(parse_one("int 1"), parse_one("CAST(1 AS INT)")) self.assertEqual(parse_one("int.5"), parse_one("CAST(0.5 AS INT)")) self.assertEqual( parse_one("TIMESTAMP '2022-01-01'").sql(), "CAST('2022-01-01' AS TIMESTAMP)" ) self.assertEqual( parse_one("TIMESTAMP(1) '2022-01-01'").sql(), "CAST('2022-01-01' AS TIMESTAMP(1))" ) self.assertEqual( parse_one("TIMESTAMP WITH TIME ZONE '2022-01-01'").sql(), "CAST('2022-01-01' AS TIMESTAMPTZ)", ) self.assertEqual( parse_one("TIMESTAMP WITH LOCAL TIME ZONE '2022-01-01'").sql(), "CAST('2022-01-01' AS TIMESTAMPLTZ)", ) self.assertEqual( parse_one("TIMESTAMP WITHOUT TIME ZONE '2022-01-01'").sql(), "CAST('2022-01-01' AS TIMESTAMP)", ) self.assertEqual( parse_one("TIMESTAMP(1) WITH TIME ZONE '2022-01-01'").sql(), "CAST('2022-01-01' AS TIMESTAMPTZ(1))", ) self.assertEqual( parse_one("TIMESTAMP(1) WITH LOCAL TIME ZONE '2022-01-01'").sql(), "CAST('2022-01-01' AS TIMESTAMPLTZ(1))", ) self.assertEqual( parse_one("TIMESTAMP(1) WITHOUT TIME ZONE '2022-01-01'").sql(), "CAST('2022-01-01' AS TIMESTAMP(1))", ) self.assertEqual(parse_one("TIMESTAMP(1) WITH TIME ZONE").sql(), "TIMESTAMPTZ(1)") self.assertEqual(parse_one("TIMESTAMP(1) WITH LOCAL TIME ZONE").sql(), "TIMESTAMPLTZ(1)") self.assertEqual(parse_one("TIMESTAMP(1) WITHOUT TIME ZONE").sql(), "TIMESTAMP(1)") self.assertEqual(parse_one("""JSON '{"x":"y"}'""").sql(), """PARSE_JSON('{"x":"y"}')""") self.assertIsInstance(parse_one("TIMESTAMP(1)"), exp.Func) self.assertIsInstance(parse_one("TIMESTAMP('2022-01-01')"), exp.Func) self.assertIsInstance(parse_one("TIMESTAMP()"), exp.Func) self.assertIsInstance(parse_one("map.x"), exp.Column) self.assertIsInstance(parse_one("CAST(x AS CHAR(5))").to.expressions[0], exp.DataTypeParam) self.assertEqual(parse_one("1::int64", dialect="bigquery"), parse_one("CAST(1 AS BIGINT)")) def test_set_expression(self): set_ = parse_one("SET") self.assertEqual(set_.sql(), "SET") self.assertIsInstance(set_, exp.Set) set_session = parse_one("SET SESSION x = 1") self.assertEqual(set_session.sql(), "SET SESSION x = 1") self.assertIsInstance(set_session, exp.Set) set_item = set_session.expressions[0] self.assertIsInstance(set_item, exp.SetItem) self.assertIsInstance(set_item.this, exp.EQ) self.assertIsInstance(set_item.this.this, exp.Identifier) self.assertIsInstance(set_item.this.expression, exp.Literal) self.assertEqual(set_item.args.get("kind"), "SESSION") set_to = parse_one("SET x TO 1") self.assertEqual(set_to.sql(), "SET x = 1") self.assertIsInstance(set_to, exp.Set) set_as_command = parse_one("SET DEFAULT ROLE ALL TO USER") self.assertEqual(set_as_command.sql(), "SET DEFAULT ROLE ALL TO USER") self.assertIsInstance(set_as_command, exp.Command) self.assertEqual(set_as_command.this, "SET") self.assertEqual(set_as_command.expression, " DEFAULT ROLE ALL TO USER") def test_pretty_config_override(self): self.assertEqual(parse_one("SELECT col FROM x").sql(), "SELECT col FROM x") with patch("sqlglot.pretty", True): self.assertEqual(parse_one("SELECT col FROM x").sql(), "SELECT\n col\nFROM x") self.assertEqual(parse_one("SELECT col FROM x").sql(pretty=True), "SELECT\n col\nFROM x") @patch("sqlglot.parser.logger") def test_comment_error_n(self, logger): parse_one( """SUM ( -- test )""", error_level=ErrorLevel.WARN, ) assert_logger_contains( "Required keyword: 'this' missing for . Line 4, Col: 1.", logger, ) @patch("sqlglot.parser.logger") def test_comment_error_r(self, logger): parse_one( """SUM(-- test\r)""", error_level=ErrorLevel.WARN, ) assert_logger_contains( "Required keyword: 'this' missing for . Line 2, Col: 1.", logger, ) @patch("sqlglot.parser.logger") def test_create_table_error(self, logger): parse_one( """CREATE TABLE SELECT""", error_level=ErrorLevel.WARN, ) assert_logger_contains( "Expected table name", logger, ) def test_rename_table(self): self.assertEqual( parse_one("ALTER TABLE foo RENAME TO bar").sql(), "ALTER TABLE foo RENAME TO bar", ) def test_pivot_columns(self): nothing_aliased = """ SELECT * FROM ( SELECT partname, price FROM part ) PIVOT (AVG(price) FOR partname IN ('prop', 'rudder')) """ everything_aliased = """ SELECT * FROM ( SELECT partname, price FROM part ) PIVOT (AVG(price) AS avg_price FOR partname IN ('prop' AS prop1, 'rudder' AS rudder1)) """ only_pivot_columns_aliased = """ SELECT * FROM ( SELECT partname, price FROM part ) PIVOT (AVG(price) FOR partname IN ('prop' AS prop1, 'rudder' AS rudder1)) """ columns_partially_aliased = """ SELECT * FROM ( SELECT partname, price FROM part ) PIVOT (AVG(price) FOR partname IN ('prop' AS prop1, 'rudder')) """ multiple_aggregates_aliased = """ SELECT * FROM ( SELECT partname, price, quality FROM part ) PIVOT (AVG(price) AS p, MAX(quality) AS q FOR partname IN ('prop' AS prop1, 'rudder')) """ multiple_aggregates_not_aliased = """ SELECT * FROM ( SELECT partname, price, quality FROM part ) PIVOT (AVG(price), MAX(quality) FOR partname IN ('prop' AS prop1, 'rudder')) """ multiple_aggregates_not_aliased_with_quoted_identifier_spark = """ SELECT * FROM ( SELECT partname, price, quality FROM part ) PIVOT (AVG(`PrIcE`), MAX(quality) FOR partname IN ('prop' AS prop1, 'rudder')) """ multiple_aggregates_not_aliased_with_quoted_identifier_duckdb = """ SELECT * FROM ( SELECT partname, price, quality FROM part ) PIVOT (AVG("PrIcE"), MAX(quality) FOR partname IN ('prop' AS prop1, 'rudder')) """ query_to_column_names = { nothing_aliased: { "bigquery": ["prop", "rudder"], "duckdb": ["prop", "rudder"], "redshift": ["prop", "rudder"], "snowflake": ['''"'prop'"''', '''"'rudder'"'''], "spark": ["prop", "rudder"], }, everything_aliased: { "bigquery": ["avg_price_prop1", "avg_price_rudder1"], "duckdb": ["prop1_avg_price", "rudder1_avg_price"], "redshift": ["prop1_avg_price", "rudder1_avg_price"], "spark": ["prop1", "rudder1"], }, only_pivot_columns_aliased: { "bigquery": ["prop1", "rudder1"], "duckdb": ["prop1", "rudder1"], "redshift": ["prop1", "rudder1"], "spark": ["prop1", "rudder1"], }, columns_partially_aliased: { "bigquery": ["prop1", "rudder"], "duckdb": ["prop1", "rudder"], "redshift": ["prop1", "rudder"], "spark": ["prop1", "rudder"], }, multiple_aggregates_aliased: { "bigquery": ["p_prop1", "q_prop1", "p_rudder", "q_rudder"], "duckdb": ["prop1_p", "prop1_q", "rudder_p", "rudder_q"], "spark": ["prop1_p", "prop1_q", "rudder_p", "rudder_q"], }, multiple_aggregates_not_aliased: { "duckdb": [ '"prop1_avg(price)"', '"prop1_max(quality)"', '"rudder_avg(price)"', '"rudder_max(quality)"', ], "spark": [ "`prop1_avg(price)`", "`prop1_max(quality)`", "`rudder_avg(price)`", "`rudder_max(quality)`", ], }, multiple_aggregates_not_aliased_with_quoted_identifier_spark: { "spark": [ "`prop1_avg(PrIcE)`", "`prop1_max(quality)`", "`rudder_avg(PrIcE)`", "`rudder_max(quality)`", ], }, multiple_aggregates_not_aliased_with_quoted_identifier_duckdb: { "duckdb": [ '"prop1_avg(PrIcE)"', '"prop1_max(quality)"', '"rudder_avg(PrIcE)"', '"rudder_max(quality)"', ], }, } for query, dialect_columns in query_to_column_names.items(): for dialect, expected_columns in dialect_columns.items(): expr = parse_one(query, read=dialect) columns = expr.args["from"].this.args["pivots"][0].args["columns"] self.assertEqual(expected_columns, [col.sql(dialect=dialect) for col in columns]) def test_parse_nested(self): now = time.time() query = parse_one( """ SELECT * FROM a LEFT JOIN b ON a.id = b.id LEFT JOIN b ON a.id = b.id LEFT JOIN b ON a.id = b.id LEFT JOIN b ON a.id = b.id LEFT JOIN b ON a.id = b.id LEFT JOIN b ON a.id = b.id LEFT JOIN b ON a.id = b.id LEFT JOIN b ON a.id = b.id LEFT JOIN b ON a.id = b.id LEFT JOIN b ON a.id = b.id LEFT JOIN b ON a.id = b.id LEFT JOIN b ON a.id = b.id LEFT JOIN b ON a.id = b.id LEFT JOIN b ON a.id = b.id LEFT JOIN b ON a.id = b.id LEFT JOIN b ON a.id = b.id LEFT JOIN b ON a.id = b.id LEFT JOIN b ON a.id = b.id LEFT JOIN b ON a.id = b.id LEFT JOIN b ON a.id = b.id LEFT JOIN b ON a.id = b.id LEFT JOIN b ON a.id = b.id LEFT JOIN b ON a.id = b.id LEFT JOIN b ON a.id = b.id LEFT JOIN b ON a.id = b.id LEFT JOIN b ON a.id = b.id LEFT JOIN b ON a.id = b.id LEFT JOIN b ON a.id = b.id LEFT JOIN b ON a.id = b.id LEFT JOIN b ON a.id = b.id LEFT JOIN b ON a.id = b.id LEFT JOIN b ON a.id = b.id LEFT JOIN b ON a.id = b.id LEFT JOIN b ON a.id = b.id LEFT JOIN b ON a.id = b.id LEFT JOIN b ON a.id = b.id LEFT JOIN b ON a.id = b.id LEFT JOIN b ON a.id = b.id """ ) self.assertIsNotNone(query) self.assertLessEqual(time.time() - now, 0.2) def test_parse_properties(self): self.assertEqual( parse_one("create materialized table x").sql(), "CREATE MATERIALIZED TABLE x" ) def test_parse_floats(self): self.assertTrue(parse_one("1. ").is_number) def test_parse_terse_coalesce(self): self.assertIsNotNone(parse_one("SELECT x ?? y FROM z").find(exp.Coalesce)) self.assertEqual( parse_one("SELECT a, b ?? 'No Data' FROM z").sql(), "SELECT a, COALESCE(b, 'No Data') FROM z", ) self.assertEqual( parse_one("SELECT a, b ?? c ?? 'No Data' FROM z").sql(), "SELECT a, COALESCE(COALESCE(b, c), 'No Data') FROM z", ) def test_parse_intervals(self): ast = parse_one( "SELECT a FROM tbl WHERE a <= DATE '1998-12-01' - INTERVAL '71 days' GROUP BY b" ) self.assertEqual(ast.find(exp.Interval).this.sql(), "'71'") self.assertEqual(ast.find(exp.Interval).unit.assert_is(exp.Var).sql(), "days") def test_parse_concat_ws(self): ast = parse_one("CONCAT_WS(' ', 'John', 'Doe')") self.assertEqual(ast.sql(), "CONCAT_WS(' ', 'John', 'Doe')") self.assertEqual(ast.expressions[0].sql(), "' '") self.assertEqual(ast.expressions[1].sql(), "'John'") self.assertEqual(ast.expressions[2].sql(), "'Doe'") # Ensure we can parse without argument when error level is ignore ast = parse( "CONCAT_WS()", error_level=ErrorLevel.IGNORE, ) self.assertEqual(ast[0].sql(), "CONCAT_WS()")