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Merge gkodinov@bk-internal.mysql.com:/home/bk/mysql-5.0-opt

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into  rakia.(none):/home/kgeorge/mysql/autopush/B21159-5.0-opt


sql/sql_select.cc:
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2006-08-15 12:54:02 +03:00
parent a0474a811c fd65e53a8a
commit 5bf943a95d
3 changed files with 23 additions and 0 deletions
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9
mysql-test/r/group_by.result
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@ -821,3 +821,12 @@ a b real_b
68 France France
DROP VIEW v1;
DROP TABLE t1,t2;
CREATE TABLE t1 (a INT, b INT, KEY(a));
INSERT INTO t1 VALUES (1, 1), (2, 2), (3,3), (4,4);
EXPLAIN SELECT a, SUM(b) FROM t1 GROUP BY a LIMIT 2;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 index NULL a 5 NULL 4
EXPLAIN SELECT a, SUM(b) FROM t1 IGNORE INDEX (a) GROUP BY a LIMIT 2;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ALL NULL NULL NULL NULL 4 Using temporary; Using filesort
DROP TABLE t1;

12
mysql-test/t/group_by.test
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@ -655,3 +655,15 @@ where t2.b=v1.a GROUP BY t2.b;
DROP VIEW v1;
DROP TABLE t1,t2;
#
# Bug #21174: Index degrades sort performance and
# optimizer does not honor IGNORE INDEX
#
CREATE TABLE t1 (a INT, b INT, KEY(a));
INSERT INTO t1 VALUES (1, 1), (2, 2), (3,3), (4,4);
EXPLAIN SELECT a, SUM(b) FROM t1 GROUP BY a LIMIT 2;
EXPLAIN SELECT a, SUM(b) FROM t1 IGNORE INDEX (a) GROUP BY a LIMIT 2;
DROP TABLE t1;