diff options
Diffstat (limited to 'mysql-test/t/join.test')
| -rw-r--r-- | mysql-test/t/join.test | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/mysql-test/t/join.test b/mysql-test/t/join.test index 6c9270f76be..4d35989aa9a 100644 --- a/mysql-test/t/join.test +++ b/mysql-test/t/join.test @@ -333,6 +333,30 @@ select t1.i,t2.i,t3.i from t2 natural right join t3,t1 order by t1.i,t2.i,t3.i; select t1.i,t2.i,t3.i from t2 right join t3 on (t2.i=t3.i),t1 order by t1.i,t2.i,t3.i; drop table t1,t2,t3; +# +# Bug #27531: Query performance degredation in 4.1.22 and greater +# +CREATE TABLE t1 (a int, b int default 0, c int default 1); + +INSERT INTO t1 (a) VALUES (1),(2),(3),(4),(5),(6),(7),(8); +INSERT INTO t1 (a) SELECT a + 8 FROM t1; +INSERT INTO t1 (a) SELECT a + 16 FROM t1; + +CREATE TABLE t2 (a int, d int, e int default 0); + +INSERT INTO t2 (a, d) VALUES (1,1),(2,2),(3,3),(4,4); +INSERT INTO t2 (a, d) SELECT a+4, a+4 FROM t2; +INSERT INTO t2 (a, d) SELECT a+8, a+8 FROM t2; + +# should use join cache +EXPLAIN +SELECT STRAIGHT_JOIN t2.e FROM t1,t2 WHERE t2.d=1 AND t1.b=t2.e + ORDER BY t1.b, t1.c; +SELECT STRAIGHT_JOIN t2.e FROM t1,t2 WHERE t2.d=1 AND t1.b=t2.e + ORDER BY t1.b, t1.c; + +DROP TABLE t1,t2; + # End of 4.1 tests # |