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#
# MDEV-26249: Crash in in Explain_node::print_explain_for_children while writing to the slow query log
#
set @sql_tmp=@@slow_query_log;
SET GLOBAL slow_query_log = 1;
SET long_query_time = 0.000000;
SET log_slow_verbosity = 'explain';
CREATE TABLE t1 ( id varchar(50), KEY (id)) engine=innodb;
SELECT * FROM (SELECT id FROM t1 GROUP BY id) dt WHERE 1=0;
id
select 1;
1
1
explain
SELECT * FROM (SELECT id FROM t1 GROUP BY id) dt WHERE 1=0;
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY NULL NULL NULL NULL NULL NULL NULL Impossible WHERE
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
#
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