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MDEV-22498: SIGSEGV in Bitmap<64u>::merge on SELECT

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For the case when the optimizer does the IN-EXISTS transformation,
the equality condition is injected in the WHERE OR HAVING clause of
the subquery. If the select list of the subquery has a reference to
the parent select make sure to use the reference and not the original
item.
This commit is contained in:
Varun Gupta
2020-05-11 19:56:14 +05:30
parent ee5152fc4b
commit efd68f5e31
3 changed files with 62 additions and 3 deletions
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32
mysql-test/r/subselect4.result
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@ -2534,3 +2534,35 @@ x
c1
1
drop table t1;
#
# MDEV-22498: SIGSEGV in Bitmap<64u>::merge on SELECT
#
set @save_sql_select_limit= @@sql_select_limit;
SET sql_select_limit=0;
CREATE TABLE t1(b INT, c INT);
CREATE TABLE t2(a INT, b INT);
INSERT INTO t1 VALUES (1,1),(2,2),(3,3);
INSERT INTO t2 VALUES (1,1),(2,2),(3,3);
EXPLAIN EXTENDED SELECT sum(a), t2.a, t2.b FROM t2 HAVING t2.a IN (SELECT t2.b FROM t1);
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY NULL NULL NULL NULL NULL NULL NULL NULL Zero limit
2 DEPENDENT SUBQUERY t1 ALL NULL NULL NULL NULL 3 100.00
Warnings:
Note 1276 Field or reference 'test.t2.b' of SELECT #2 was resolved in SELECT #1
Note 1276 Field or reference 'test.t2.b' of SELECT #2 was resolved in SELECT #1
Note 1003 select sum(`test`.`t2`.`a`) AS `sum(a)`,`test`.`t2`.`a` AS `a`,`test`.`t2`.`b` AS `b` from `test`.`t2` having <in_optimizer>(`test`.`t2`.`a`,<exists>(select `test`.`t2`.`b` from `test`.`t1` where (<cache>(`test`.`t2`.`a`) = `test`.`t2`.`b`)))
SELECT sum(a), t2.a, t2.b FROM t2 HAVING t2.a IN (SELECT t2.b FROM t1);
sum(a) a b
SET @@sql_select_limit= @save_sql_select_limit;
EXPLAIN EXTENDED SELECT sum(a), t2.a, t2.b FROM t2 HAVING t2.a IN (SELECT t2.b FROM t1);
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY t2 ALL NULL NULL NULL NULL 3 100.00
2 DEPENDENT SUBQUERY t1 ALL NULL NULL NULL NULL 3 100.00
Warnings:
Note 1276 Field or reference 'test.t2.b' of SELECT #2 was resolved in SELECT #1
Note 1276 Field or reference 'test.t2.b' of SELECT #2 was resolved in SELECT #1
Note 1003 select sum(`test`.`t2`.`a`) AS `sum(a)`,`test`.`t2`.`a` AS `a`,`test`.`t2`.`b` AS `b` from `test`.`t2` having <expr_cache><`test`.`t2`.`a`,`test`.`t2`.`b`>(<in_optimizer>(`test`.`t2`.`a`,<exists>(select `test`.`t2`.`b` from `test`.`t1` where (<cache>(`test`.`t2`.`a`) = `test`.`t2`.`b`))))
SELECT sum(a), t2.a, t2.b FROM t2 HAVING t2.a IN (SELECT t2.b FROM t1);
sum(a) a b
6 1 1
DROP TABLE t1,t2;