lp:985667 Wrong result with subquery in SELECT clause, and constant table in main query and implicit grouping

CREATE TABLE t1 (f1 int) ;

INSERT INTO t1 VALUES (7),(8);

CREATE TABLE t2 (f2 int, f3 varchar(32)) ;

INSERT INTO t2 VALUES (1,'f');

SELECT COUNT(f2), (SELECT f1 FROM t1 WHERE t2.f2 limit 1) AS f4

FROM t2, t1

WHERE 'v'= t2.f3;

+-----------+------+

| COUNT(f2) | f4   |

+-----------+------+

|         0 |    7 |

+-----------+------+

+-----------+------+

| COUNT(f2) | f4   |

+-----------+------+

|         0 | NULL |

+-----------+------+