diff options
Diffstat (limited to 'mysql-test/t/order_by.test')
| -rw-r--r-- | mysql-test/t/order_by.test | 41 |
1 files changed, 41 insertions, 0 deletions
diff --git a/mysql-test/t/order_by.test b/mysql-test/t/order_by.test index f09c1aa7bd4..cca1e3209cc 100644 --- a/mysql-test/t/order_by.test +++ b/mysql-test/t/order_by.test @@ -1361,3 +1361,44 @@ DROP TABLE t1; +# +# Bug#46454: MySQL wrong index optimisation leads to incorrect result & crashes +# +CREATE TABLE t1 ( + a INT, + b INT NOT NULL, + c char(100), + KEY (b, c), + KEY (b, a, c) +) +DEFAULT CHARSET = utf8; + +INSERT INTO t1 VALUES +(1, 1, 1), +(2, 2, 2), +(3, 3, 3), +(4, 4, 4), +(5, 5, 5), +(6, 6, 6), +(7, 7, 7), +(8, 8, 8), +(9, 9, 9); + +INSERT INTO t1 SELECT a + 10, b, c FROM t1; +INSERT INTO t1 SELECT a + 20, b, c FROM t1; +INSERT INTO t1 SELECT a + 40, b, c FROM t1; +INSERT INTO t1 SELECT a + 80, b, c FROM t1; +INSERT INTO t1 SELECT a + 160, b, c FROM t1; +INSERT INTO t1 SELECT a + 320, b, c FROM t1; +INSERT INTO t1 SELECT a + 640, b, c FROM t1; +INSERT INTO t1 SELECT a + 1280, b, c FROM t1 LIMIT 80; + +EXPLAIN +SELECT a FROM t1 WHERE b = 1 ORDER BY c DESC LIMIT 9; +SELECT a FROM t1 WHERE b = 1 ORDER BY c DESC LIMIT 9; + +EXPLAIN +SELECT DISTINCT a FROM t1 WHERE b = 1 ORDER BY c DESC LIMIT 0, 9; +SELECT DISTINCT a FROM t1 WHERE b = 1 ORDER BY c DESC LIMIT 0, 9; + +DROP TABLE t1; |