CREATE TABLE `t1` (
`c0` varchar(100) NOT NULL,
KEY `ic1` (`c0`)
);
INSERT INTO `t1` VALUES (' '), ('-1555786384'), ('0OqU'), ('<kWmNizZ');

CREATE TABLE `t2` (
`c0` varchar(100) NOT NULL
);
INSERT INTO `t2` VALUES ('Yc'), ('L*1'), ('-239020720'), (''), ('D47');

mysql> SET SESSION join_cache_level = 4;
Query OK, 0 rows affected (0.00 sec)

mysql> SELECT t2.c0 FROM t2 RIGHT OUTER JOIN t1 ON t1.c0 = t2.c0;
------

------

------
4 rows in set (0.01 sec)

mysql> SET optimizer_switch='join_cache_hashed=off';
Query OK, 0 rows affected (0.00 sec)

mysql> SELECT t2.c0 FROM t2 RIGHT OUTER JOIN t1 ON t1.c0 = t2.c0;
------

------

------
4 rows in set (0.00 sec)