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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
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