LP:702374 - wrong query result in subselect_sj.test

The testcase for "Bug#46550 Azalea returning duplicate results for some IN subqueries" in subselect_sj.test produces wrong results:

CREATE TABLE t0 (
int_key int(11) DEFAULT NULL,
varchar_key varchar(1) DEFAULT NULL,
varchar_nokey varchar(1) DEFAULT NULL,
KEY int_key (int_key),
KEY varchar_key (varchar_key,int_key)
);

INSERT INTO t0 VALUES
(1,'m','m'),
(40,'h','h'),
(1,'r','r'),
(1,'h','h'),
(9,'x','x'),
(NULL,'q','q'),
(NULL,'k','k'),
(7,'l','l'),
(182,'k','k'),
(202,'a','a'),
(7,'x','x'),
(6,'j','j'),
(119,'z','z'),
(4,'d','d'),
(5,'h','h'),
(1,'u','u'),
(3,'q','q'),
(7,'a','a'),
(3,'e','e'),
(6,'l','l');

CREATE TABLE t1 (
int_key int(11) DEFAULT NULL,
varchar_key varchar(1) DEFAULT NULL,
varchar_nokey varchar(1) DEFAULT NULL,
KEY int_key (int_key),
KEY varchar_key (varchar_key,int_key)
);
INSERT INTO t1 VALUES (7,NULL,NULL),(4,'x','x');

CREATE TABLE t2 (
int_key int(11) DEFAULT NULL,
varchar_key varchar(1) DEFAULT NULL,
varchar_nokey varchar(1) DEFAULT NULL,
KEY int_key (int_key),
KEY varchar_key (varchar_key,int_key)
);
INSERT INTO t2 VALUES (123,NULL,NULL);

MariaDB [j6]> SELECT t0.int_key FROM t0, t2 WHERE t0.varchar_nokey IN (SELECT t1_1 .varchar_key FROM t1 AS t1_1 JOIN t1 AS t1_2 ON t1_1 .int_key);
---------

---------

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

The correct result is

, i.e. we get duplicates.