cte.slt

# Copyright Materialize, Inc. and contributors. All rights reserved.
#
# Use of this software is governed by the Business Source License
# included in the LICENSE file at the root of this repository.
#
# As of the Change Date specified in that file, in accordance with
# the Business Source License, use of this software will be governed
# by the Apache License, Version 2.0.

# Additional tests in test/sqllogictest/cockroach/with.slt

mode cockroach

statement ok
CREATE TABLE x (a int)

statement ok
INSERT INTO x VALUES (1), (2), (3)

statement ok
CREATE TABLE y (a int)

statement ok
INSERT INTO y VALUES (2), (3), (4)

# Check that a CTE on the lhs of a join works
query I
WITH t AS (SELECT * FROM y WHERE a < 3)
  SELECT * FROM t NATURAL JOIN x
----
2

# Using a CTE inside a correlated subquery
query I
WITH t(x) AS (SELECT * FROM y WHERE a < 3)
  SELECT * FROM x WHERE a IN (
    SELECT a FROM t WHERE x.a = t.x
  )
----
2

# Using a correlated subquery inside a CTE
query I
SELECT * FROM x WHERE a IN
  (WITH t AS (SELECT * FROM y WHERE y.a = x.a) SELECT * FROM t);
----
2
3

statement error more than one record produced in subquery
WITH c AS (SELECT a + 1 FROM x) SELECT (SELECT * FROM c);

# Allow re-using names laterally.
query I rowsort
SELECT * FROM (
  (WITH c AS (SELECT 1) SELECT * FROM c)
  UNION ALL
  (WITH c AS (SELECT 2) SELECT * FROM c)
)
----
1
2

statement error specified more than once
SELECT * FROM (
  (WITH c AS (SELECT 1), c AS (SELECT 2)
  SELECT * FROM c UNION ALL SELECT * FROM c)
)

# Allow re-using names nested.
query I rowsort
SELECT * FROM (
  (WITH c AS (SELECT 1) SELECT * FROM
    (WITH c AS (SELECT 2) SELECT * FROM c)
    UNION ALL
    SELECT * FROM c
  )
)
----
1
2

# CTE names should only be accessible in their scope.
statement error unknown catalog item
SELECT * FROM (
  (WITH c AS (SELECT 1) SELECT * FROM c)
    UNION ALL
  SELECT * FROM c
)

query I
WITH foo AS (SELECT 1)
  (SELECT * FROM foo
    UNION ALL
  (WITH foo AS (SELECT 2) SELECT * FROM foo)
    UNION ALL
  (SELECT * FROM foo))
----
1
1
2

# See 5766.
query error column "a2.f1" does not exist
SELECT * FROM (VALUES (true)) a2 (f1) WHERE (
    SELECT TRUE FROM (VALUES (true)) AS a2 (f2)
    WHERE (SELECT a2.f1)
)

statement ok
CREATE TABLE squares (x int, y int);

statement ok
CREATE TABLE roots (x int, y int);

statement ok
CREATE TABLE cubes (x int, y int);

statement ok
INSERT INTO squares VALUES
    (1, 1), (2, 4), (3, 9), (4, 16);

statement ok
INSERT INTO roots VALUES
    (1, 1), (4, 2), (9, 3), (16, 4);

statement ok
INSERT INTO cubes VALUES
    (1, 1), (2, 8), (3, 27), (4, 16);

# Correlated expression––this should only return values where squares.y is
# in roots.y and sqaures.x
query II
SELECT * FROM squares
WHERE x IN (
    SELECT y FROM roots
    WHERE y IN (
        SELECT squares.y
    )
);
----
1 1

# Correlated CTE
query II
SELECT * FROM squares
WHERE x IN (
    WITH squares_y AS (
        SELECT squares.y
    )
    SELECT y FROM roots
    WHERE y IN (
        SELECT y FROM squares_y
    )
);
----
1 1

# Same query, but inside a view. Regression test for #5092.
statement ok
CREATE MATERIALIZED VIEW v AS
SELECT * FROM squares
WHERE x IN (
    WITH squares_y AS (
        SELECT squares.y
    )
    SELECT y FROM roots
    WHERE y IN (
        SELECT y FROM squares_y
    )
);

query II
SELECT * FROM v
----
1 1

# Correlated CTE in different level than it was introduced. This is needlessly
# convoluted but caused crashes in early iterations of CTE's development.
query II
SELECT * FROM squares
WHERE x IN (
    WITH squares_x AS (
        SELECT squares.x
    )
    SELECT t0.x
    FROM (
        SELECT roots.x
        FROM roots
        JOIN (
            SELECT t2.x FROM (
                SELECT cubes.x FROM cubes
                JOIN squares_x
                ON squares_x.x = cubes.x
                WHERE cubes.x IN (SELECT x FROM squares_x)
            ) t2
        ) AS t1
        ON t1.x = roots.x
    ) AS t0
);
----
1 1
4 16

# Use same query at two levels. Obtusely check for quadratic powers.
query I rowsort
WITH squares_y AS (
    SELECT y FROM squares
  )
SELECT * FROM squares_y WHERE y IN (
  SELECT y * y FROM squares_y
)
----
1
16

# PostgreSQL tests
query TT
WITH q AS (SELECT 'foo' AS x)
SELECT x, pg_typeof(x)  FROM q;
----
foo text

query I rowsort
WITH outermost(x) AS (
  SELECT 1
  UNION (WITH innermost as (SELECT 2)
         SELECT * FROM innermost
         UNION SELECT 3)
)
SELECT * FROM outermost ORDER BY 1;
----
1
2
3

query error unknown catalog item 'outermost'
WITH outermost(x) AS (
  SELECT 1
  UNION (WITH innermost as (SELECT 2)
         SELECT * FROM outermost  -- fail
         UNION SELECT * FROM innermost)
)
SELECT * FROM outermost ORDER BY 1;