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MDEV-18668 Server crash or ASAN use-after-poison in Item_equal_iterator /

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st_select_lex::pushdown_from_having_into_where upon query
           with impossible WHERE condition

Do not push from HAVING into impossible WHERE
This commit is contained in:
Igor Babaev
2019-02-24 02:02:07 -08:00
parent 31deef0953
commit 25870f48cf
3 changed files with 30 additions and 1 deletions
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13
mysql-test/main/having_cond_pushdown.test
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@ -473,3 +473,16 @@ eval $no_pushdown explain format=json $query;
DROP TABLE t1,t2;
DROP VIEW v1;
DROP FUNCTION f1;
--echo #
--echo # MDEV-18668: pushdown from HAVING into impossible WHERE
--echo #
CREATE TABLE t1 (a INT, b INT);
INSERT INTO t1 VALUES (1,1),(2,2);
SELECT a FROM t1 WHERE b = 1 AND b = 2 GROUP BY a HAVING a <= 3;
EXPLAIN
SELECT a FROM t1 WHERE b = 1 AND b = 2 GROUP BY a HAVING a <= 3;
DROP TABLE t1;