from __future__ import annotations import unittest import sqlglot from sqlglot.lineage import lineage from sqlglot.schema import MappingSchema class TestLineage(unittest.TestCase): maxDiff = None @classmethod def setUpClass(cls): sqlglot.schema = MappingSchema() def test_lineage(self) -> None: node = lineage( "a", "SELECT a FROM z", schema={"x": {"a": "int"}}, sources={"y": "SELECT * FROM x", "z": "SELECT a FROM y"}, ) self.assertEqual( node.source.sql(), "SELECT z.a AS a FROM (SELECT y.a AS a FROM (SELECT x.a AS a FROM x AS x) AS y /* source: y */) AS z /* source: z */", ) self.assertEqual(node.alias, "") downstream = node.downstream[0] self.assertEqual( downstream.source.sql(), "SELECT y.a AS a FROM (SELECT x.a AS a FROM x AS x) AS y /* source: y */", ) self.assertEqual(downstream.alias, "z") downstream = downstream.downstream[0] self.assertEqual( downstream.source.sql(), "SELECT x.a AS a FROM x AS x", ) self.assertEqual(downstream.alias, "y") self.assertGreater(len(node.to_html()._repr_html_()), 1000) def test_lineage_sql_with_cte(self) -> None: node = lineage( "a", "WITH z AS (SELECT a FROM y) SELECT a FROM z", schema={"x": {"a": "int"}}, sources={"y": "SELECT * FROM x"}, ) self.assertEqual( node.source.sql(), "WITH z AS (SELECT y.a AS a FROM (SELECT x.a AS a FROM x AS x) AS y /* source: y */) SELECT z.a AS a FROM z", ) self.assertEqual(node.alias, "") # Node containing expanded CTE expression downstream = node.downstream[0] self.assertEqual( downstream.source.sql(), "SELECT y.a AS a FROM (SELECT x.a AS a FROM x AS x) AS y /* source: y */", ) self.assertEqual(downstream.alias, "") downstream = downstream.downstream[0] self.assertEqual( downstream.source.sql(), "SELECT x.a AS a FROM x AS x", ) self.assertEqual(downstream.alias, "y") def test_lineage_source_with_cte(self) -> None: node = lineage( "a", "SELECT a FROM z", schema={"x": {"a": "int"}}, sources={"z": "WITH y AS (SELECT * FROM x) SELECT a FROM y"}, ) self.assertEqual( node.source.sql(), "SELECT z.a AS a FROM (WITH y AS (SELECT x.a AS a FROM x AS x) SELECT y.a AS a FROM y) AS z /* source: z */", ) self.assertEqual(node.alias, "") downstream = node.downstream[0] self.assertEqual( downstream.source.sql(), "WITH y AS (SELECT x.a AS a FROM x AS x) SELECT y.a AS a FROM y", ) self.assertEqual(downstream.alias, "z") downstream = downstream.downstream[0] self.assertEqual( downstream.source.sql(), "SELECT x.a AS a FROM x AS x", ) self.assertEqual(downstream.alias, "") def test_lineage_source_with_star(self) -> None: node = lineage( "a", "WITH y AS (SELECT * FROM x) SELECT a FROM y", ) self.assertEqual( node.source.sql(), "WITH y AS (SELECT * FROM x AS x) SELECT y.a AS a FROM y", ) self.assertEqual(node.alias, "") downstream = node.downstream[0] self.assertEqual( downstream.source.sql(), "SELECT * FROM x AS x", ) self.assertEqual(downstream.alias, "") def test_lineage_external_col(self) -> None: node = lineage( "a", "WITH y AS (SELECT * FROM x) SELECT a FROM y JOIN z USING (uid)", ) self.assertEqual( node.source.sql(), "WITH y AS (SELECT * FROM x AS x) SELECT a AS a FROM y JOIN z AS z ON y.uid = z.uid", ) self.assertEqual(node.alias, "") downstream = node.downstream[0] self.assertEqual( downstream.source.sql(), "?", ) self.assertEqual(downstream.alias, "") def test_lineage_values(self) -> None: node = lineage( "a", "SELECT a FROM y", sources={"y": "SELECT a FROM (VALUES (1), (2)) AS t (a)"}, ) self.assertEqual( node.source.sql(), "SELECT y.a AS a FROM (SELECT t.a AS a FROM (VALUES (1), (2)) AS t(a)) AS y /* source: y */", ) self.assertEqual(node.alias, "") downstream = node.downstream[0] self.assertEqual(downstream.source.sql(), "SELECT t.a AS a FROM (VALUES (1), (2)) AS t(a)") self.assertEqual(downstream.expression.sql(), "t.a AS a") self.assertEqual(downstream.alias, "y") downstream = downstream.downstream[0] self.assertEqual(downstream.source.sql(), "(VALUES (1), (2)) AS t(a)") self.assertEqual(downstream.expression.sql(), "a") self.assertEqual(downstream.alias, "") def test_lineage_cte_name_appears_in_schema(self) -> None: schema = {"a": {"b": {"t1": {"c1": "int"}, "t2": {"c2": "int"}}}} node = lineage( "c2", "WITH t1 AS (SELECT * FROM a.b.t2), inter AS (SELECT * FROM t1) SELECT * FROM inter", schema=schema, ) self.assertEqual( node.source.sql(), "WITH t1 AS (SELECT t2.c2 AS c2 FROM a.b.t2 AS t2), inter AS (SELECT t1.c2 AS c2 FROM t1) SELECT inter.c2 AS c2 FROM inter", ) self.assertEqual(node.alias, "") downstream = node.downstream[0] self.assertEqual(downstream.source.sql(), "SELECT t1.c2 AS c2 FROM t1") self.assertEqual(downstream.expression.sql(), "t1.c2 AS c2") self.assertEqual(downstream.alias, "") downstream = downstream.downstream[0] self.assertEqual(downstream.source.sql(), "SELECT t2.c2 AS c2 FROM a.b.t2 AS t2") self.assertEqual(downstream.expression.sql(), "t2.c2 AS c2") self.assertEqual(downstream.alias, "") downstream = downstream.downstream[0] self.assertEqual(downstream.source.sql(), "a.b.t2 AS t2") self.assertEqual(downstream.expression.sql(), "a.b.t2 AS t2") self.assertEqual(downstream.alias, "") self.assertEqual(downstream.downstream, []) def test_lineage_union(self) -> None: node = lineage( "x", "SELECT ax AS x FROM a UNION SELECT bx FROM b UNION SELECT cx FROM c", ) assert len(node.downstream) == 3 node = lineage( "x", "SELECT x FROM (SELECT ax AS x FROM a UNION SELECT bx FROM b UNION SELECT cx FROM c)", ) assert len(node.downstream) == 3 def test_lineage_lateral_flatten(self) -> None: node = lineage( "VALUE", "SELECT FLATTENED.VALUE FROM TEST_TABLE, LATERAL FLATTEN(INPUT => RESULT, OUTER => TRUE) FLATTENED", dialect="snowflake", ) self.assertEqual(node.name, "VALUE") downstream = node.downstream[0] self.assertEqual(downstream.name, "FLATTENED.VALUE") self.assertEqual( downstream.source.sql(dialect="snowflake"), "LATERAL FLATTEN(INPUT => TEST_TABLE.RESULT, OUTER => TRUE) AS FLATTENED(SEQ, KEY, PATH, INDEX, VALUE, THIS)", ) self.assertEqual( downstream.expression.sql(dialect="snowflake"), "VALUE", ) self.assertEqual(len(downstream.downstream), 1) downstream = downstream.downstream[0] self.assertEqual(downstream.name, "TEST_TABLE.RESULT") self.assertEqual(downstream.source.sql(dialect="snowflake"), "TEST_TABLE AS TEST_TABLE") def test_subquery(self) -> None: node = lineage( "output", "SELECT (SELECT max(t3.my_column) my_column FROM foo t3) AS output FROM table3", ) self.assertEqual(node.name, "SUBQUERY") node = node.downstream[0] self.assertEqual(node.name, "my_column") node = node.downstream[0] self.assertEqual(node.name, "t3.my_column") self.assertEqual(node.source.sql(), "foo AS t3") def test_lineage_cte_union(self) -> None: query = """ WITH dataset AS ( SELECT * FROM catalog.db.table_a UNION SELECT * FROM catalog.db.table_b ) SELECT x, created_at FROM dataset; """ node = lineage("x", query) self.assertEqual(node.name, "x") downstream_a = node.downstream[0] self.assertEqual(downstream_a.name, "0") self.assertEqual(downstream_a.source.sql(), "SELECT * FROM catalog.db.table_a AS table_a") downstream_b = node.downstream[1] self.assertEqual(downstream_b.name, "0") self.assertEqual(downstream_b.source.sql(), "SELECT * FROM catalog.db.table_b AS table_b") def test_select_star(self) -> None: node = lineage("x", "SELECT x from (SELECT * from table_a)") self.assertEqual(node.name, "x") downstream = node.downstream[0] self.assertEqual(downstream.name, "_q_0.x") self.assertEqual(downstream.source.sql(), "SELECT * FROM table_a AS table_a") downstream = downstream.downstream[0] self.assertEqual(downstream.name, "*") self.assertEqual(downstream.source.sql(), "table_a AS table_a")