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MDEV-9513: Assertion `join->group_list || !join->is_in_subquery()' failed in create_sort_index

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Removing the ORDER BY clause from the UNION when UNION is inside an IN/ALL/ANY/EXISTS subquery.
The rewrites are done for subqueries but this rewrite is not done for the fake_select of
the UNION.
This commit is contained in:
Varun Gupta
2020-08-04 14:36:01 +05:30
parent 0e80f5a693
commit ab578bdf45
4 changed files with 89 additions and 0 deletions
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41
mysql-test/r/subselect4.result
View File

@ -2608,3 +2608,44 @@ region area population
Central America and the Caribbean 442 66422
SET @@optimizer_switch= @save_optimizer_switch;
DROP TABLE t1;
#
# MDEV-9513: Assertion `join->group_list || !join->is_in_subquery()' failed in create_sort_index
#
CREATE TABLE t1 (a INT);
INSERT INTO t1 VALUES (1),(2);
CREATE TABLE t2 (a INT);
INSERT INTO t2 VALUES (2),(3);
EXPLAIN
SELECT t1.a FROM t1 WHERE t1.a IN ( SELECT A.a FROM t1 A UNION SELECT B.a FROM t2 B ORDER BY 1);
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t1 ALL NULL NULL NULL NULL 2 Using where
2 DEPENDENT SUBQUERY A ALL NULL NULL NULL NULL 2 Using where
3 DEPENDENT UNION B ALL NULL NULL NULL NULL 2 Using where
NULL UNION RESULT <union2,3> ALL NULL NULL NULL NULL NULL
SELECT t1.a FROM t1 WHERE t1.a IN ( SELECT A.a FROM t1 A UNION SELECT B.a FROM t2 B ORDER BY 1);
a
1
2
EXPLAIN
SELECT t1.a FROM t1 WHERE EXISTS (SELECT A.a FROM t1 A UNION SELECT B.a FROM t2 B ORDER BY 1);
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t1 ALL NULL NULL NULL NULL 2
2 SUBQUERY A ALL NULL NULL NULL NULL 2
3 UNION B ALL NULL NULL NULL NULL 2
NULL UNION RESULT <union2,3> ALL NULL NULL NULL NULL NULL
SELECT t1.a FROM t1 WHERE EXISTS (SELECT A.a FROM t1 A UNION SELECT B.a FROM t2 B ORDER BY 1);
a
1
2
EXPLAIN
SELECT t1.a FROM t1 WHERE t1.a IN ( SELECT A.a FROM t1 A UNION ALL SELECT B.a FROM t2 B ORDER BY 1);
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t1 ALL NULL NULL NULL NULL 2 Using where
2 DEPENDENT SUBQUERY A ALL NULL NULL NULL NULL 2 Using where
3 DEPENDENT UNION B ALL NULL NULL NULL NULL 2 Using where
SELECT t1.a FROM t1 WHERE t1.a IN ( SELECT A.a FROM t1 A UNION ALL SELECT B.a FROM t2 B ORDER BY 1);
a
1
2
DROP TABLE t1,t2;
# end of 10.1 tests