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MDEV-31181 Server crash in subselect_uniquesubquery_engine::print upon EXPLAIN EXTENDED DELETE

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Temporary fix to avoid the server crash.
This commit is contained in:
Oleksandr Byelkin
2023-05-04 08:11:00 +02:00
parent 62ec258f10
commit f5e7c56e32
3 changed files with 43 additions and 0 deletions
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18
mysql-test/main/explain_innodb.result
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@ -18,3 +18,21 @@ id select_type table type possible_keys key key_len ref rows Extra
2 DERIVED t1 index NULL id 53 NULL 1 Using index
SET GLOBAL slow_query_log = @sql_tmp;
drop table t1;
#
# MDEV-31181: Server crash in subselect_uniquesubquery_engine::print
# upon EXPLAIN EXTENDED DELETE
#
CREATE TABLE t1 (a INT);
INSERT INTO t1 VALUES (1),(2);
CREATE TABLE t2 (pk INT PRIMARY KEY);
INSERT INTO t2 VALUES (1),(2);
EXPLAIN EXTENDED DELETE FROM t1 WHERE a IN (SELECT pk FROM t2);
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY t1 ALL NULL NULL NULL NULL 2 100.00 Using where
2 DEPENDENT SUBQUERY t2 unique_subquery PRIMARY PRIMARY 4 func 1 100.00 Using index
Warnings:
Note 1003 /* select#1 */ delete from `test`.`t1` where <in_optimizer>(`test`.`t1`.`a`,<exists>(<primary_index_lookup>(<cache>(`test`.`t1`.`a`))))
drop table t1, t2;
#
# End of 10.4 tests
#