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cte_lowering.slt
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# 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.
# Test that correlated CTE are lowered properly
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 CTEs aren't inlined during planning
query T multiline
EXPLAIN RAW PLAN FOR
WITH t AS (SELECT * FROM y WHERE a < 3)
SELECT * FROM t NATURAL JOIN t a;
----
Project (#0)
Return
InnerJoin (true AND (#0 = #1))
Get l0
Get l0
With
cte l0 =
Filter (#0 < 3)
Get materialize.public.y
EOF
# Check that CTE defined in outer context is explained properly
query T multiline
EXPLAIN RAW PLAN FOR
WITH t AS (SELECT * FROM y WHERE a < 3)
SELECT * FROM y WHERE (select a from t) < a;
----
Return
Filter (select(Get l0) < #0)
Get materialize.public.y
With
cte l0 =
Filter (#0 < 3)
Get materialize.public.y
EOF
# Check the body of a CTE is only lowered once
query T multiline
EXPLAIN DECORRELATED PLAN WITH(arity) FOR
WITH t AS (SELECT * FROM y WHERE a < 3)
SELECT * FROM t NATURAL JOIN t a;
----
Return // { arity: 1 }
Project (#0) // { arity: 1 }
Filter (true AND (#0 = #1)) // { arity: 2 }
Project (#0, #1) // { arity: 2 }
CrossJoin // { arity: 2 }
Get l0 // { arity: 1 }
Get l0 // { arity: 1 }
With
cte l0 =
Filter (#0 < 3) // { arity: 1 }
CrossJoin // { arity: 1 }
Constant // { arity: 0 }
- ()
Get materialize.public.y // { arity: 1 }
EOF
# Correlated CTE inside a LATERAL join operand
query T multiline
EXPLAIN DECORRELATED PLAN WITH(arity) FOR
SELECT *
FROM x,
LATERAL(WITH a(m) AS (SELECT max(y.a) FROM y WHERE y.a < x.a)
SELECT * FROM a);
----
Return // { arity: 2 }
Filter true // { arity: 2 }
Project (#0, #2) // { arity: 2 }
Join on=(#0 = #1) // { arity: 3 }
Get l0 // { arity: 1 }
Union // { arity: 2 }
Get l2 // { arity: 2 }
CrossJoin // { arity: 2 }
Project (#0) // { arity: 1 }
Join on=(#0 = #1) // { arity: 2 }
Union // { arity: 1 }
Negate // { arity: 1 }
Distinct project=[#0] // { arity: 1 }
Get l2 // { arity: 2 }
Distinct project=[#0] // { arity: 1 }
Get l1 // { arity: 1 }
Get l1 // { arity: 1 }
Constant // { arity: 1 }
- (null)
With
cte l2 =
Reduce group_by=[#0] aggregates=[max(#1)] // { arity: 2 }
Filter (#1 < #0) // { arity: 2 }
CrossJoin // { arity: 2 }
Get l1 // { arity: 1 }
Get materialize.public.y // { arity: 1 }
cte l1 =
Distinct project=[#0] // { arity: 1 }
Get l0 // { arity: 1 }
cte l0 =
CrossJoin // { arity: 1 }
Constant // { arity: 0 }
- ()
Get materialize.public.x // { arity: 1 }
EOF
query II
SELECT *
FROM x,
LATERAL(WITH a(m) AS (SELECT max(y.a) FROM y WHERE y.a < x.a)
SELECT * FROM a);
----
1 NULL
2 NULL
3 2
# Reference of a correlated CTE applied to an outer relation that has the same cardinality as
# the one the CTE was applied to.
# When the CTE is lowered, the outer relation is `Get x`. But then, the reference of the CTE
# is applied to `Distinct(Join(Get x, Get y), x.*)` which has the same cardinality as `Get x`.
query T multiline
EXPLAIN DECORRELATED PLAN WITH(arity) FOR
SELECT *
FROM x,
LATERAL(WITH a(m) as (SELECT max(y.a) FROM y WHERE y.a < x.a)
SELECT (SELECT m FROM a) FROM y) b;
----
Return // { arity: 2 }
Filter true // { arity: 2 }
Project (#0, #2) // { arity: 2 }
Join on=(#0 = #1) // { arity: 3 }
Get l0 // { arity: 1 }
Project (#0, #2) // { arity: 2 }
Project (#0, #1, #5) // { arity: 3 }
Map (#4) // { arity: 6 }
Join on=(#0 = #2 AND #1 = #3) // { arity: 5 }
Get l3 // { arity: 2 }
Project (#0, #1, #3) // { arity: 3 }
Join on=(#0 = #2) // { arity: 4 }
Get l4 // { arity: 2 }
Union // { arity: 2 }
Get l7 // { arity: 2 }
CrossJoin // { arity: 2 }
Project (#0) // { arity: 1 }
Join on=(#0 = #1) // { arity: 2 }
Union // { arity: 1 }
Negate // { arity: 1 }
Distinct project=[#0] // { arity: 1 }
Get l7 // { arity: 2 }
Distinct project=[#0] // { arity: 1 }
Get l5 // { arity: 1 }
Get l5 // { arity: 1 }
Constant // { arity: 1 }
- (null)
With
cte l7 =
Union // { arity: 2 }
Get l6 // { arity: 2 }
Map (error("more than one record produced in subquery")) // { arity: 2 }
Project (#0) // { arity: 1 }
Filter (#1 > 1) // { arity: 2 }
Reduce group_by=[#0] aggregates=[count(*)] // { arity: 2 }
Get l6 // { arity: 2 }
cte l6 =
Project (#0, #2) // { arity: 2 }
Join on=(#0 = #1) // { arity: 3 }
Get l5 // { arity: 1 }
Union // { arity: 2 }
Get l2 // { arity: 2 }
CrossJoin // { arity: 2 }
Project (#0) // { arity: 1 }
Join on=(#0 = #1) // { arity: 2 }
Union // { arity: 1 }
Negate // { arity: 1 }
Distinct project=[#0] // { arity: 1 }
Get l2 // { arity: 2 }
Distinct project=[#0] // { arity: 1 }
Get l1 // { arity: 1 }
Get l1 // { arity: 1 }
Constant // { arity: 1 }
- (null)
cte l5 =
Distinct project=[#0] // { arity: 1 }
Get l4 // { arity: 2 }
cte l4 =
Distinct project=[#0, #1] // { arity: 2 }
Get l3 // { arity: 2 }
cte l3 =
CrossJoin // { arity: 2 }
Get l1 // { arity: 1 }
Get materialize.public.y // { arity: 1 }
cte l2 =
Reduce group_by=[#0] aggregates=[max(#1)] // { arity: 2 }
Filter (#1 < #0) // { arity: 2 }
CrossJoin // { arity: 2 }
Get l1 // { arity: 1 }
Get materialize.public.y // { arity: 1 }
cte l1 =
Distinct project=[#0] // { arity: 1 }
Get l0 // { arity: 1 }
cte l0 =
CrossJoin // { arity: 1 }
Constant // { arity: 0 }
- ()
Get materialize.public.x // { arity: 1 }
EOF
# Correlated CTE used at different scope level: offset 0 and offset 1 (RHS of the join)
# Note: the CTE is represented by %12 (l4)
query T multiline
EXPLAIN DECORRELATED PLAN WITH(arity) FOR
SELECT *
FROM x,
LATERAL(WITH a(m) AS (SELECT max(y.a) FROM y WHERE y.a < x.a)
SELECT * FROM a INNER JOIN a b ON a.m = b.m);
----
Return // { arity: 3 }
Filter true // { arity: 3 }
Project (#0, #2, #3) // { arity: 3 }
Join on=(#0 = #1) // { arity: 4 }
Get l0 // { arity: 1 }
Filter (#1 = #2) // { arity: 3 }
Project (#0, #1, #3) // { arity: 3 }
Join on=(#0 = #2) // { arity: 4 }
Get l3 // { arity: 2 }
Get l3 // { arity: 2 }
With
cte l3 =
Union // { arity: 2 }
Get l2 // { arity: 2 }
CrossJoin // { arity: 2 }
Project (#0) // { arity: 1 }
Join on=(#0 = #1) // { arity: 2 }
Union // { arity: 1 }
Negate // { arity: 1 }
Distinct project=[#0] // { arity: 1 }
Get l2 // { arity: 2 }
Distinct project=[#0] // { arity: 1 }
Get l1 // { arity: 1 }
Get l1 // { arity: 1 }
Constant // { arity: 1 }
- (null)
cte l2 =
Reduce group_by=[#0] aggregates=[max(#1)] // { arity: 2 }
Filter (#1 < #0) // { arity: 2 }
CrossJoin // { arity: 2 }
Get l1 // { arity: 1 }
Get materialize.public.y // { arity: 1 }
cte l1 =
Distinct project=[#0] // { arity: 1 }
Get l0 // { arity: 1 }
cte l0 =
CrossJoin // { arity: 1 }
Constant // { arity: 0 }
- ()
Get materialize.public.x // { arity: 1 }
EOF
query III
SELECT *
FROM x,
LATERAL(WITH a(m) AS (SELECT max(y.a) FROM y WHERE y.a < x.a)
SELECT * FROM a INNER JOIN a b ON a.m = b.m);
----
3 2 2
query III
SELECT *
FROM x,
LATERAL(WITH a(m) as (SELECT max(y.a) FROM y WHERE y.a < x.a)
SELECT * FROM a INNER JOIN a b ON true);
----
1 NULL NULL
2 NULL NULL
3 2 2
# Correlated CTE used at different scope level: offset 0 and offset 3 (subquery in the
# selection list of a derived relation in the RHS of the join)
query T multiline
EXPLAIN DECORRELATED PLAN WITH(arity) FOR
SELECT *
FROM x,
LATERAL(WITH a(m) as (SELECT max(y.a) FROM y WHERE y.a < x.a)
SELECT * FROM a INNER JOIN (SELECT (SELECT m FROM a) FROM y) b ON true);
----
Return // { arity: 3 }
Filter true // { arity: 3 }
Project (#0, #2, #3) // { arity: 3 }
Join on=(#0 = #1) // { arity: 4 }
Get l0 // { arity: 1 }
Filter true // { arity: 3 }
Project (#0, #1, #3) // { arity: 3 }
Join on=(#0 = #2) // { arity: 4 }
Get l3 // { arity: 2 }
Project (#0, #5) // { arity: 2 }
Map (#4) // { arity: 6 }
Join on=(#0 = #2 AND #1 = #3) // { arity: 5 }
Get l4 // { arity: 2 }
Project (#0, #1, #3) // { arity: 3 }
Join on=(#0 = #2) // { arity: 4 }
Get l5 // { arity: 2 }
Union // { arity: 2 }
Get l8 // { arity: 2 }
CrossJoin // { arity: 2 }
Project (#0) // { arity: 1 }
Join on=(#0 = #1) // { arity: 2 }
Union // { arity: 1 }
Negate // { arity: 1 }
Distinct project=[#0] // { arity: 1 }
Get l8 // { arity: 2 }
Distinct project=[#0] // { arity: 1 }
Get l6 // { arity: 1 }
Get l6 // { arity: 1 }
Constant // { arity: 1 }
- (null)
With
cte l8 =
Union // { arity: 2 }
Get l7 // { arity: 2 }
Map (error("more than one record produced in subquery")) // { arity: 2 }
Project (#0) // { arity: 1 }
Filter (#1 > 1) // { arity: 2 }
Reduce group_by=[#0] aggregates=[count(*)] // { arity: 2 }
Get l7 // { arity: 2 }
cte l7 =
Project (#0, #2) // { arity: 2 }
Join on=(#0 = #1) // { arity: 3 }
Get l6 // { arity: 1 }
Get l3 // { arity: 2 }
cte l6 =
Distinct project=[#0] // { arity: 1 }
Get l5 // { arity: 2 }
cte l5 =
Distinct project=[#0, #1] // { arity: 2 }
Get l4 // { arity: 2 }
cte l4 =
CrossJoin // { arity: 2 }
Get l1 // { arity: 1 }
Get materialize.public.y // { arity: 1 }
cte l3 =
Union // { arity: 2 }
Get l2 // { arity: 2 }
CrossJoin // { arity: 2 }
Project (#0) // { arity: 1 }
Join on=(#0 = #1) // { arity: 2 }
Union // { arity: 1 }
Negate // { arity: 1 }
Distinct project=[#0] // { arity: 1 }
Get l2 // { arity: 2 }
Distinct project=[#0] // { arity: 1 }
Get l1 // { arity: 1 }
Get l1 // { arity: 1 }
Constant // { arity: 1 }
- (null)
cte l2 =
Reduce group_by=[#0] aggregates=[max(#1)] // { arity: 2 }
Filter (#1 < #0) // { arity: 2 }
CrossJoin // { arity: 2 }
Get l1 // { arity: 1 }
Get materialize.public.y // { arity: 1 }
cte l1 =
Distinct project=[#0] // { arity: 1 }
Get l0 // { arity: 1 }
cte l0 =
CrossJoin // { arity: 1 }
Constant // { arity: 0 }
- ()
Get materialize.public.x // { arity: 1 }
EOF
query III
SELECT *
FROM x,
LATERAL(WITH a(m) AS (SELECT max(y.a) FROM y WHERE y.a < x.a)
SELECT * FROM a INNER JOIN (SELECT (SELECT m FROM a) FROM y) b ON true);
----
1 NULL NULL
1 NULL NULL
1 NULL NULL
2 NULL NULL
2 NULL NULL
2 NULL NULL
3 2 2
3 2 2
3 2 2
# Correlated CTE used from a correlated scope
# Note: the CTE is represented by %12 (l4)
query T multiline
EXPLAIN DECORRELATED PLAN WITH(arity) FOR
SELECT *
FROM x,
LATERAL(WITH a(m) AS (SELECT max(y.a) FROM y WHERE y.a < x.a)
SELECT * FROM y INNER JOIN LATERAL(SELECT y.a FROM x WHERE (SELECT m FROM a) > 0) ON true);
----
Return // { arity: 3 }
Filter true // { arity: 3 }
Project (#0, #2, #3) // { arity: 3 }
Join on=(#0 = #1) // { arity: 4 }
Get l0 // { arity: 1 }
Filter true // { arity: 3 }
Project (#0, #1, #3) // { arity: 3 }
Join on=(#1 = #2) // { arity: 4 }
Get l3 // { arity: 2 }
Project (#0, #2) // { arity: 2 }
Map (#0) // { arity: 3 }
Project (#0, #1) // { arity: 2 }
Filter (#2 > 0) // { arity: 3 }
Project (#0, #1, #3) // { arity: 3 }
Join on=(#0 = #2) // { arity: 4 }
Get l4 // { arity: 2 }
Union // { arity: 2 }
Get l7 // { arity: 2 }
CrossJoin // { arity: 2 }
Project (#0) // { arity: 1 }
Join on=(#0 = #1) // { arity: 2 }
Union // { arity: 1 }
Negate // { arity: 1 }
Distinct project=[#0] // { arity: 1 }
Get l7 // { arity: 2 }
Distinct project=[#0] // { arity: 1 }
Get l5 // { arity: 1 }
Get l5 // { arity: 1 }
Constant // { arity: 1 }
- (null)
With
cte l7 =
Union // { arity: 2 }
Get l6 // { arity: 2 }
Map (error("more than one record produced in subquery")) // { arity: 2 }
Project (#0) // { arity: 1 }
Filter (#1 > 1) // { arity: 2 }
Reduce group_by=[#0] aggregates=[count(*)] // { arity: 2 }
Get l6 // { arity: 2 }
cte l6 =
Project (#0, #2) // { arity: 2 }
Join on=(#0 = #1) // { arity: 3 }
Get l5 // { arity: 1 }
Union // { arity: 2 }
Get l2 // { arity: 2 }
CrossJoin // { arity: 2 }
Project (#0) // { arity: 1 }
Join on=(#0 = #1) // { arity: 2 }
Union // { arity: 1 }
Negate // { arity: 1 }
Distinct project=[#0] // { arity: 1 }
Get l2 // { arity: 2 }
Distinct project=[#0] // { arity: 1 }
Get l1 // { arity: 1 }
Get l1 // { arity: 1 }
Constant // { arity: 1 }
- (null)
cte l5 =
Distinct project=[#0] // { arity: 1 }
Get l4 // { arity: 2 }
cte l4 =
Filter true // { arity: 2 }
CrossJoin // { arity: 2 }
Distinct project=[#1] // { arity: 1 }
Get l3 // { arity: 2 }
Get materialize.public.x // { arity: 1 }
cte l3 =
CrossJoin // { arity: 2 }
Get l1 // { arity: 1 }
Get materialize.public.y // { arity: 1 }
cte l2 =
Reduce group_by=[#0] aggregates=[max(#1)] // { arity: 2 }
Filter (#1 < #0) // { arity: 2 }
CrossJoin // { arity: 2 }
Get l1 // { arity: 1 }
Get materialize.public.y // { arity: 1 }
cte l1 =
Distinct project=[#0] // { arity: 1 }
Get l0 // { arity: 1 }
cte l0 =
CrossJoin // { arity: 1 }
Constant // { arity: 0 }
- ()
Get materialize.public.x // { arity: 1 }
EOF
# Check that CTEs are annotated with their names
query T multiline
EXPLAIN RAW PLAN FOR
WITH a(a) AS (SELECT a FROM y),
b(b) AS (SELECT a FROM y),
x(x) AS (SELECT b FROM b)
SELECT (WITH c(c) AS (SELECT a FROM y)
SELECT c FROM c where (WITH d(d) AS (SELECT c FROM c)
SELECT max(d) FROM d) > 1)
FROM (WITH e(e) AS (SELECT b FROM b)
SELECT e FROM e where (WITH f(f) AS (SELECT e FROM e)
SELECT min(f) FROM f)
< (SELECT max(x) FROM x))
----
Project (#1)
Return
Map (select(Get l8))
Return
Filter (select(Get l6) < select(Get l7))
Get l3
With
cte l6 =
Return
Reduce aggregates=[min(#0)]
Get l4
With
cte l4 =
Get l3
cte l7 =
Reduce aggregates=[max(#0)]
Get l2
cte l3 =
Get l1
With
cte l8 =
Return
Filter (select(Get l5) > 1)
Get l3
With
cte l5 =
Return
Reduce aggregates=[max(#0)]
Get l4
With
cte l4 =
Get l3
cte l3 =
Get materialize.public.y
cte l2 =
Get l1
cte l1 =
Get materialize.public.y
cte l0 =
Get materialize.public.y
EOF
# CTEs with the same name in nested context
query T multiline
EXPLAIN RAW PLAN FOR
WITH a(a) AS (SELECT a FROM y) SELECT * FROM (WITH a(a) AS (SELECT a FROM a) SELECT a FROM a);
----
Return
Get l1
With
cte l1 =
Get l0
cte l0 =
Get materialize.public.y
EOF