diff options
Diffstat (limited to 'mysql-test/t/group_min_max.test')
| -rw-r--r-- | mysql-test/t/group_min_max.test | 60 |
1 files changed, 60 insertions, 0 deletions
diff --git a/mysql-test/t/group_min_max.test b/mysql-test/t/group_min_max.test index 08f0f54df60..5ed082f7583 100644 --- a/mysql-test/t/group_min_max.test +++ b/mysql-test/t/group_min_max.test @@ -810,3 +810,63 @@ explain SELECT MIN(c) FROM t2 WHERE b = 2 and a = 1 and c > 1 GROUP BY a; SELECT MIN(c) FROM t2 WHERE b = 2 and a = 1 and c > 1 GROUP BY a; DROP TABLE t1,t2; + +# +# Bug#24156: Loose index scan not used with CREATE TABLE ...SELECT and similar statements +# + +CREATE TABLE t1 (a INT, b INT, INDEX (a,b)); +INSERT INTO t1 (a, b) VALUES (1,1), (1,2), (1,3), (1,4), (1,5), + (2,2), (2,3), (2,1), (3,1), (4,1), (4,2), (4,3), (4,4), (4,5), (4,6); +EXPLAIN SELECT max(b), a FROM t1 GROUP BY a; +FLUSH STATUS; +SELECT max(b), a FROM t1 GROUP BY a; +SHOW STATUS LIKE 'handler_read__e%'; +EXPLAIN SELECT max(b), a FROM t1 GROUP BY a; +FLUSH STATUS; +CREATE TABLE t2 SELECT max(b), a FROM t1 GROUP BY a; +SHOW STATUS LIKE 'handler_read__e%'; +FLUSH STATUS; +SELECT * FROM (SELECT max(b), a FROM t1 GROUP BY a) b; +SHOW STATUS LIKE 'handler_read__e%'; +FLUSH STATUS; +(SELECT max(b), a FROM t1 GROUP BY a) UNION + (SELECT max(b), a FROM t1 GROUP BY a); +SHOW STATUS LIKE 'handler_read__e%'; +EXPLAIN (SELECT max(b), a FROM t1 GROUP BY a) UNION + (SELECT max(b), a FROM t1 GROUP BY a); + +EXPLAIN SELECT (SELECT max(b) FROM t1 GROUP BY a HAVING a < 2) x + FROM t1 AS t1_outer; +EXPLAIN SELECT 1 FROM t1 AS t1_outer WHERE EXISTS + (SELECT max(b) FROM t1 GROUP BY a HAVING a < 2); +EXPLAIN SELECT 1 FROM t1 AS t1_outer WHERE + (SELECT max(b) FROM t1 GROUP BY a HAVING a < 2) > 12; +EXPLAIN SELECT 1 FROM t1 AS t1_outer WHERE + a IN (SELECT max(b) FROM t1 GROUP BY a HAVING a < 2); +EXPLAIN SELECT 1 FROM t1 AS t1_outer GROUP BY a HAVING + a > (SELECT max(b) FROM t1 GROUP BY a HAVING a < 2); +EXPLAIN SELECT 1 FROM t1 AS t1_outer1 JOIN t1 AS t1_outer2 + ON t1_outer1.a = (SELECT max(b) FROM t1 GROUP BY a HAVING a < 2) + AND t1_outer1.b = t1_outer2.b; +EXPLAIN SELECT (SELECT (SELECT max(b) FROM t1 GROUP BY a HAVING a < 2) x + FROM t1 AS t1_outer) x2 FROM t1 AS t1_outer2; + +CREATE TABLE t3 LIKE t1; +FLUSH STATUS; +INSERT INTO t3 SELECT a,MAX(b) FROM t1 GROUP BY a; +SHOW STATUS LIKE 'handler_read__e%'; +DELETE FROM t3; +FLUSH STATUS; +INSERT INTO t3 SELECT 1, (SELECT MAX(b) FROM t1 GROUP BY a HAVING a < 2) + FROM t1 LIMIT 1; +SHOW STATUS LIKE 'handler_read__e%'; +FLUSH STATUS; +DELETE FROM t3 WHERE (SELECT MAX(b) FROM t1 GROUP BY a HAVING a < 2) > 10000; +SHOW STATUS LIKE 'handler_read__e%'; +FLUSH STATUS; +DELETE FROM t3 WHERE (SELECT (SELECT MAX(b) FROM t1 GROUP BY a HAVING a < 2) x + FROM t1) > 10000; +SHOW STATUS LIKE 'handler_read__e%'; + +DROP TABLE t1,t2,t3; |