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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, "output")
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")
node = lineage(
"y",
"SELECT SUM((SELECT max(a) a from x) + (SELECT min(b) b from x) + c) AS y FROM x",
)
self.assertEqual(node.name, "y")
self.assertEqual(len(node.downstream), 3)
self.assertEqual(node.downstream[0].name, "a")
self.assertEqual(node.downstream[1].name, "b")
self.assertEqual(node.downstream[2].name, "x.c")
node = lineage(
"x",
"WITH cte AS (SELECT a, b FROM z) SELECT sum(SELECT a FROM cte) AS x, (SELECT b FROM cte) as y FROM cte",
)
self.assertEqual(node.name, "x")
self.assertEqual(len(node.downstream), 1)
node = node.downstream[0]
self.assertEqual(node.name, "a")
node = node.downstream[0]
self.assertEqual(node.name, "cte.a")
node = node.downstream[0]
self.assertEqual(node.name, "z.a")
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")
def test_unnest(self) -> None:
node = lineage(
"b",
"with _data as (select [struct(1 as a, 2 as b)] as col) select b from _data cross join unnest(col)",
)
self.assertEqual(node.name, "b")
|
