drop table if exists t0,t1,t2,t3;
#
# MDEV-6434: Wrong result (extra rows) with ORDER BY, multiple-column index, InnoDB
#
CREATE TABLE t1 (a INT, b INT, c INT, d TEXT, KEY idx(a,b,c)) ENGINE=InnoDB;
INSERT INTO t1 (a,c) VALUES
(8, 9),(8, 10),(13, 15),(16, 17),(16, 18),(16, 19),(20, 21),
(20, 22),(20, 24),(20, 25),(20, 26),(20, 27),(20, 28);
SELECT  * FROM t1 WHERE a = 8 AND (b = 1 OR b IS NULL) ORDER BY c;
a	b	c	d
8	NULL	9	NULL
8	NULL	10	NULL
DROP TABLE t1;