diff options
Diffstat (limited to 'mysql-test/r/subselect3.result')
| -rw-r--r-- | mysql-test/r/subselect3.result | 51 |
1 files changed, 51 insertions, 0 deletions
diff --git a/mysql-test/r/subselect3.result b/mysql-test/r/subselect3.result index efb7a417bb0..1fc9309da4f 100644 --- a/mysql-test/r/subselect3.result +++ b/mysql-test/r/subselect3.result @@ -117,6 +117,7 @@ show status like '%Handler_read%'; Variable_name Value Handler_read_first 0 Handler_read_key 0 +Handler_read_last 0 Handler_read_next 0 Handler_read_prev 0 Handler_read_rnd 0 @@ -1426,3 +1427,53 @@ CALL p1; ERROR 42S22: Unknown column 'f1' in 'where clause' DROP PROCEDURE p1; DROP TABLE t1, t2; +# +# BUG#48920: COUNT DISTINCT returns 1 for NULL values when in a subquery +# in the select list +# + +CREATE TABLE t1 ( +i int(11) DEFAULT NULL, +v varchar(1) DEFAULT NULL +); + +INSERT INTO t1 VALUES (8,'v'); +INSERT INTO t1 VALUES (9,'r'); +INSERT INTO t1 VALUES (NULL,'y'); + +CREATE TABLE t2 ( +i int(11) DEFAULT NULL, +v varchar(1) DEFAULT NULL, +KEY i_key (i) +); + +INSERT INTO t2 VALUES (NULL,'r'); +INSERT INTO t2 VALUES (0,'c'); +INSERT INTO t2 VALUES (0,'o'); +INSERT INTO t2 VALUES (2,'v'); +INSERT INTO t2 VALUES (7,'c'); + +SELECT i, v, (SELECT COUNT(DISTINCT i) +FROM t1 +WHERE v = t2.v) as subsel +FROM t2; +i v subsel +NULL r 1 +0 c 0 +0 o 0 +2 v 1 +7 c 0 + +EXPLAIN EXTENDED +SELECT i, v, (SELECT COUNT(DISTINCT i) +FROM t1 +WHERE v = t2.v) as subsel +FROM t2; +id select_type table type possible_keys key key_len ref rows filtered Extra +1 PRIMARY t2 ALL NULL NULL NULL NULL 5 100.00 +2 DEPENDENT SUBQUERY t1 ALL NULL NULL NULL NULL 3 100.00 Using where +Warnings: +Note 1276 Field or reference 'test.t2.v' of SELECT #2 was resolved in SELECT #1 +Note 1003 select `test`.`t2`.`i` AS `i`,`test`.`t2`.`v` AS `v`,(select count(distinct `test`.`t1`.`i`) from `test`.`t1` where (`test`.`t1`.`v` = `test`.`t2`.`v`)) AS `subsel` from `test`.`t2` +DROP TABLE t1,t2; +End of 5.6 tests |