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Diffstat (limited to 'mysql-test/t/merge.test')
| -rw-r--r-- | mysql-test/t/merge.test | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/mysql-test/t/merge.test b/mysql-test/t/merge.test index a4602a3b82a..76e746db037 100644 --- a/mysql-test/t/merge.test +++ b/mysql-test/t/merge.test @@ -1394,3 +1394,19 @@ FLUSH TABLES m1, t1; UNLOCK TABLES; DROP TABLE t1, m1; +# +# Bug#36006 - Optimizer does table scan for select count(*) +# +CREATE TABLE t1(C1 INT, C2 INT, KEY C1(C1), KEY C2(C2)) ENGINE=MYISAM; +CREATE TABLE t2(C1 INT, C2 INT, KEY C1(C1), KEY C2(C2)) ENGINE=MYISAM; +CREATE TABLE t3(C1 INT, C2 INT, KEY C1(C1), KEY C2(C2)) ENGINE=MYISAM; +CREATE TABLE t4(C1 INT, C2 INT, KEY C1(C1), KEY C2(C2)) + ENGINE=MRG_MYISAM UNION=(t1, t2, t3); +INSERT INTO t1 VALUES (1,1), (1,2),(1,3), (1,4); +INSERT INTO t2 VALUES (2,1), (2,2),(2,3), (2,4); +INSERT INTO t3 VALUES (3,1), (3,2),(3,3), (3,4); +EXPLAIN SELECT COUNT(*) FROM t1; +EXPLAIN SELECT COUNT(*) FROM t4; +DROP TABLE t1, t2, t3, t4; + +--echo End of 5.1 tests |