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MDEV-22852: SIGSEGV in sortlength (optimized builds)

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The issue here is for a DEPENDENT subquery that has an aggregate function in the ORDER BY clause,
is wrapped inside an Item_aggregate_ref. For computation of ORDER BY we need to refer to the
temp table field corresponding to this item. But in the function make_sortorder, we were
explicitly casting Item_aggrgate_ref to Item_sum, which leads to us not getting the temp
table field corresponding to the item.
This commit is contained in:
Varun Gupta
2020-07-01 11:39:22 +05:30
parent 4a2e7b5368
commit fbfb5b5f68
3 changed files with 32 additions and 1 deletions
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12
mysql-test/r/subselect4.result
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@ -2566,3 +2566,15 @@ 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;
#
# MDEV-22852: SIGSEGV in sortlength (optimized builds)
#
SET @save_optimizer_switch=@@optimizer_switch;
SET optimizer_switch='subquery_cache=off';
CREATE TABLE t1 (a INT,b INT);
INSERT INTO t1 VALUES (0,0),(0,0);
SELECT (SELECT DISTINCT t1i.b FROM t1 t1i GROUP BY t1i.a ORDER BY MAX(t1o.b)) FROM t1 AS t1o;
(SELECT DISTINCT t1i.b FROM t1 t1i GROUP BY t1i.a ORDER BY MAX(t1o.b))
0
SET @@optimizer_switch= @save_optimizer_switch;
DROP TABLE t1;