diff options
Diffstat (limited to 'mysql-test/t/group_by.test')
| -rw-r--r-- | mysql-test/t/group_by.test | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/mysql-test/t/group_by.test b/mysql-test/t/group_by.test index 1e65bef19b7..d6d1922c10f 100644 --- a/mysql-test/t/group_by.test +++ b/mysql-test/t/group_by.test @@ -432,3 +432,27 @@ select id, sum(qty) as sqty, count(qty) as cqty from t1 group by id having sum(q select count(*), case interval(qty,2,3,4,5,6,7,8) when -1 then NULL when 0 then "zero" when 1 then "one" when 2 then "two" end as category from t1 group by category; select count(*), interval(qty,2,3,4,5,6,7,8) as category from t1 group by category; drop table t1; +# +# Tests for bug #1355: 'Using filesort' is missing in EXPLAIN when ORDER BY +# NULL is used. +# +CREATE TABLE t1 ( + userid int(10) unsigned, + score smallint(5) unsigned, + key (score) +); +INSERT INTO t1 VALUES (1,1),(2,2),(1,1),(3,3),(3,3),(3,3),(3,3),(3,3); +# Here we select unordered GROUP BY into a temporary talbe, +# and then sort it with filesort (GROUP BY in MySQL +# implies sorted order of results) +SELECT userid,count(*) FROM t1 GROUP BY userid DESC; +EXPLAIN SELECT userid,count(*) FROM t1 GROUP BY userid DESC; +DROP TABLE t1; +CREATE TABLE t1 ( + i int(11) default NULL, + j int(11) default NULL +); +INSERT INTO t1 VALUES (1,2),(2,3),(4,5),(3,5),(1,5),(23,5); +SELECT i, COUNT(DISTINCT(i)) FROM t1 GROUP BY j ORDER BY NULL; +explain SELECT i, COUNT(DISTINCT(i)) FROM t1 GROUP BY j ORDER BY NULL; +DROP TABLE t1; |