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|
import unittest
from functools import partial
from sqlglot import exp, optimizer, parse_one, table
from sqlglot.errors import OptimizeError
from sqlglot.optimizer.annotate_types import annotate_types
from sqlglot.optimizer.schema import MappingSchema, ensure_schema
from sqlglot.optimizer.scope import build_scope, traverse_scope, walk_in_scope
from tests.helpers import TPCH_SCHEMA, load_sql_fixture_pairs, load_sql_fixtures
class TestOptimizer(unittest.TestCase):
maxDiff = None
def setUp(self):
self.schema = {
"x": {
"a": "INT",
"b": "INT",
},
"y": {
"b": "INT",
"c": "INT",
},
"z": {
"b": "INT",
"c": "INT",
},
}
def check_file(self, file, func, pretty=False, **kwargs):
for i, (meta, sql, expected) in enumerate(load_sql_fixture_pairs(f"optimizer/{file}.sql"), start=1):
dialect = meta.get("dialect")
leave_tables_isolated = meta.get("leave_tables_isolated")
func_kwargs = {**kwargs}
if leave_tables_isolated is not None:
func_kwargs["leave_tables_isolated"] = leave_tables_isolated.lower() in ("true", "1")
with self.subTest(f"{i}, {sql}"):
self.assertEqual(
func(parse_one(sql, read=dialect), **func_kwargs).sql(pretty=pretty, dialect=dialect),
expected,
)
def test_optimize(self):
schema = {
"x": {"a": "INT", "b": "INT"},
"y": {"a": "INT", "b": "INT"},
"z": {"a": "INT", "c": "INT"},
}
self.check_file("optimizer", optimizer.optimize, pretty=True, schema=schema)
def test_isolate_table_selects(self):
self.check_file(
"isolate_table_selects",
optimizer.isolate_table_selects.isolate_table_selects,
)
def test_qualify_tables(self):
self.check_file(
"qualify_tables",
optimizer.qualify_tables.qualify_tables,
db="db",
catalog="c",
)
def test_normalize(self):
self.assertEqual(
optimizer.normalize.normalize(
parse_one("x AND (y OR z)"),
dnf=True,
).sql(),
"(x AND y) OR (x AND z)",
)
self.check_file(
"normalize",
optimizer.normalize.normalize,
)
def test_qualify_columns(self):
def qualify_columns(expression, **kwargs):
expression = optimizer.qualify_tables.qualify_tables(expression)
expression = optimizer.qualify_columns.qualify_columns(expression, **kwargs)
return expression
self.check_file("qualify_columns", qualify_columns, schema=self.schema)
def test_qualify_columns__invalid(self):
for sql in load_sql_fixtures("optimizer/qualify_columns__invalid.sql"):
with self.subTest(sql):
with self.assertRaises(OptimizeError):
optimizer.qualify_columns.qualify_columns(parse_one(sql), schema=self.schema)
def test_quote_identities(self):
self.check_file("quote_identities", optimizer.quote_identities.quote_identities)
def test_pushdown_projection(self):
def pushdown_projections(expression, **kwargs):
expression = optimizer.qualify_tables.qualify_tables(expression)
expression = optimizer.qualify_columns.qualify_columns(expression, **kwargs)
expression = optimizer.pushdown_projections.pushdown_projections(expression)
return expression
self.check_file("pushdown_projections", pushdown_projections, schema=self.schema)
def test_simplify(self):
self.check_file("simplify", optimizer.simplify.simplify)
def test_unnest_subqueries(self):
self.check_file(
"unnest_subqueries",
optimizer.unnest_subqueries.unnest_subqueries,
pretty=True,
)
def test_pushdown_predicates(self):
self.check_file("pushdown_predicates", optimizer.pushdown_predicates.pushdown_predicates)
def test_expand_multi_table_selects(self):
self.check_file(
"expand_multi_table_selects",
optimizer.expand_multi_table_selects.expand_multi_table_selects,
)
def test_optimize_joins(self):
self.check_file(
"optimize_joins",
optimizer.optimize_joins.optimize_joins,
)
def test_merge_subqueries(self):
optimize = partial(
optimizer.optimize,
rules=[
optimizer.qualify_tables.qualify_tables,
optimizer.qualify_columns.qualify_columns,
optimizer.merge_subqueries.merge_subqueries,
],
)
self.check_file("merge_subqueries", optimize, schema=self.schema)
def test_eliminate_subqueries(self):
self.check_file("eliminate_subqueries", optimizer.eliminate_subqueries.eliminate_subqueries)
def test_tpch(self):
self.check_file("tpc-h/tpc-h", optimizer.optimize, schema=TPCH_SCHEMA, pretty=True)
def test_schema(self):
schema = ensure_schema(
{
"x": {
"a": "uint64",
}
}
)
self.assertEqual(
schema.column_names(
table(
"x",
)
),
["a"],
)
with self.assertRaises(ValueError):
schema.column_names(table("x", db="db", catalog="c"))
with self.assertRaises(ValueError):
schema.column_names(table("x", db="db"))
with self.assertRaises(ValueError):
schema.column_names(table("x2"))
schema = ensure_schema(
{
"db": {
"x": {
"a": "uint64",
}
}
}
)
self.assertEqual(schema.column_names(table("x", db="db")), ["a"])
with self.assertRaises(ValueError):
schema.column_names(table("x", db="db", catalog="c"))
with self.assertRaises(ValueError):
schema.column_names(table("x"))
with self.assertRaises(ValueError):
schema.column_names(table("x", db="db2"))
with self.assertRaises(ValueError):
schema.column_names(table("x2", db="db"))
schema = ensure_schema(
{
"c": {
"db": {
"x": {
"a": "uint64",
}
}
}
}
)
self.assertEqual(schema.column_names(table("x", db="db", catalog="c")), ["a"])
with self.assertRaises(ValueError):
schema.column_names(table("x", db="db"))
with self.assertRaises(ValueError):
schema.column_names(table("x"))
with self.assertRaises(ValueError):
schema.column_names(table("x", db="db", catalog="c2"))
with self.assertRaises(ValueError):
schema.column_names(table("x", db="db2"))
with self.assertRaises(ValueError):
schema.column_names(table("x2", db="db"))
schema = ensure_schema(
MappingSchema(
{
"x": {
"a": "uint64",
}
}
)
)
self.assertEqual(schema.column_names(table("x")), ["a"])
with self.assertRaises(OptimizeError):
ensure_schema({})
def test_file_schema(self):
expression = parse_one(
"""
SELECT *
FROM READ_CSV('tests/fixtures/optimizer/tpc-h/nation.csv.gz', 'delimiter', '|')
"""
)
self.assertEqual(
"""
SELECT
"_q_0"."n_nationkey" AS "n_nationkey",
"_q_0"."n_name" AS "n_name",
"_q_0"."n_regionkey" AS "n_regionkey",
"_q_0"."n_comment" AS "n_comment"
FROM READ_CSV('tests/fixtures/optimizer/tpc-h/nation.csv.gz', 'delimiter', '|') AS "_q_0"
""".strip(),
optimizer.optimize(expression).sql(pretty=True),
)
def test_scope(self):
sql = """
WITH q AS (
SELECT x.b FROM x
), r AS (
SELECT y.b FROM y
)
SELECT
r.b,
s.b
FROM r
JOIN (
SELECT y.c AS b FROM y
) s
ON s.b = r.b
WHERE s.b > (SELECT MAX(x.a) FROM x WHERE x.b = s.b)
"""
expression = parse_one(sql)
for scopes in traverse_scope(expression), list(build_scope(expression).traverse()):
self.assertEqual(len(scopes), 5)
self.assertEqual(scopes[0].expression.sql(), "SELECT x.b FROM x")
self.assertEqual(scopes[1].expression.sql(), "SELECT y.b FROM y")
self.assertEqual(scopes[2].expression.sql(), "SELECT y.c AS b FROM y")
self.assertEqual(scopes[3].expression.sql(), "SELECT MAX(x.a) FROM x WHERE x.b = s.b")
self.assertEqual(scopes[4].expression.sql(), parse_one(sql).sql())
self.assertEqual(set(scopes[4].sources), {"q", "r", "s"})
self.assertEqual(len(scopes[4].columns), 6)
self.assertEqual(set(c.table for c in scopes[4].columns), {"r", "s"})
self.assertEqual(scopes[4].source_columns("q"), [])
self.assertEqual(len(scopes[4].source_columns("r")), 2)
self.assertEqual(set(c.table for c in scopes[4].source_columns("r")), {"r"})
self.assertEqual({c.sql() for c in scopes[-1].find_all(exp.Column)}, {"r.b", "s.b"})
self.assertEqual(scopes[-1].find(exp.Column).sql(), "r.b")
self.assertEqual({c.sql() for c in scopes[0].find_all(exp.Column)}, {"x.b"})
# Check that we can walk in scope from an arbitrary node
self.assertEqual(
{node.sql() for node, *_ in walk_in_scope(expression.find(exp.Where)) if isinstance(node, exp.Column)},
{"s.b"},
)
def test_literal_type_annotation(self):
tests = {
"SELECT 5": exp.DataType.Type.INT,
"SELECT 5.3": exp.DataType.Type.DOUBLE,
"SELECT 'bla'": exp.DataType.Type.VARCHAR,
"5": exp.DataType.Type.INT,
"5.3": exp.DataType.Type.DOUBLE,
"'bla'": exp.DataType.Type.VARCHAR,
}
for sql, target_type in tests.items():
expression = parse_one(sql)
annotated_expression = annotate_types(expression)
self.assertEqual(annotated_expression.find(exp.Literal).type, target_type)
def test_boolean_type_annotation(self):
tests = {
"SELECT TRUE": exp.DataType.Type.BOOLEAN,
"FALSE": exp.DataType.Type.BOOLEAN,
}
for sql, target_type in tests.items():
expression = parse_one(sql)
annotated_expression = annotate_types(expression)
self.assertEqual(annotated_expression.find(exp.Boolean).type, target_type)
def test_cast_type_annotation(self):
expression = parse_one("CAST('2020-01-01' AS TIMESTAMPTZ(9))")
annotate_types(expression)
self.assertEqual(expression.type, exp.DataType.Type.TIMESTAMPTZ)
self.assertEqual(expression.this.type, exp.DataType.Type.VARCHAR)
self.assertEqual(expression.args["to"].type, exp.DataType.Type.TIMESTAMPTZ)
self.assertEqual(expression.args["to"].expressions[0].type, exp.DataType.Type.INT)
def test_cache_annotation(self):
expression = parse_one("CACHE LAZY TABLE x OPTIONS('storageLevel' = 'value') AS SELECT 1")
annotated_expression = annotate_types(expression)
self.assertEqual(annotated_expression.expression.expressions[0].type, exp.DataType.Type.INT)
def test_binary_annotation(self):
expression = parse_one("SELECT 0.0 + (2 + 3)")
annotate_types(expression)
expression = expression.expressions[0]
self.assertEqual(expression.type, exp.DataType.Type.DOUBLE)
self.assertEqual(expression.left.type, exp.DataType.Type.DOUBLE)
self.assertEqual(expression.right.type, exp.DataType.Type.INT)
self.assertEqual(expression.right.this.type, exp.DataType.Type.INT)
self.assertEqual(expression.right.this.left.type, exp.DataType.Type.INT)
self.assertEqual(expression.right.this.right.type, exp.DataType.Type.INT)
|
