LP:993726 - Wrong result from a query with ALL subquery predicate in WHERE

The following sequence of commands returns an incorrect result set in maridb-5.2:

CREATE TABLE t1(a INT);
INSERT INTO t1 VALUES (0);
SELECT 1 FROM t1 WHERE 1 > ALL(SELECT 1 FROM t1 WHERE a!=0);

MariaDB [test]> SELECT 1 FROM t1 WHERE 1 > ALL(SELECT 1 FROM t1 WHERE a!=0);
Empty set (0.00 sec)

(see also bug #12888306 for mysql code line)