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Merge magare.gmz:/home/kgeorge/mysql/work/B32268-5.0-opt

Browse source 
into  magare.gmz:/home/kgeorge/mysql/work/B32268-5.1-opt


mysql-test/r/group_min_max.result:
  Auto merged
mysql-test/t/group_min_max.test:
  Auto merged
sql/sql_select.cc:
  Auto merged
This commit is contained in:
unknown 2007-11-26 13:33:36 +02:00
commit 9eb12eb945
3 changed files with 72 additions and 1 deletions
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46
mysql-test/r/group_min_max.result
View file

@ -2326,3 +2326,49 @@ a
2
4
DROP TABLE t1;
CREATE TABLE t1 (a INT, b INT);
INSERT INTO t1 (a, b) VALUES (1,1), (1,2), (1,3);
INSERT INTO t1 SELECT a + 1, b FROM t1;
INSERT INTO t1 SELECT a + 2, b FROM t1;
EXPLAIN
SELECT a, MIN(b), MAX(b) FROM t1 GROUP BY a ORDER BY a DESC;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ALL NULL NULL NULL NULL 12 Using temporary; Using filesort
SELECT a, MIN(b), MAX(b) FROM t1 GROUP BY a ORDER BY a DESC;
a MIN(b) MAX(b)
4 1 3
3 1 3
2 1 3
1 1 3
CREATE INDEX break_it ON t1 (a, b);
EXPLAIN
SELECT a, MIN(b), MAX(b) FROM t1 GROUP BY a ORDER BY a;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range NULL break_it 10 NULL 7 Using index for group-by
SELECT a, MIN(b), MAX(b) FROM t1 GROUP BY a ORDER BY a;
a MIN(b) MAX(b)
1 1 3
2 1 3
3 1 3
4 1 3
EXPLAIN
SELECT a, MIN(b), MAX(b) FROM t1 GROUP BY a ORDER BY a DESC;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range NULL break_it 10 NULL 7 Using index for group-by; Using temporary; Using filesort
SELECT a, MIN(b), MAX(b) FROM t1 GROUP BY a ORDER BY a DESC;
a MIN(b) MAX(b)
4 1 3
3 1 3
2 1 3
1 1 3
EXPLAIN
SELECT a, MIN(b), MAX(b), AVG(b) FROM t1 GROUP BY a ORDER BY a DESC;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 index NULL break_it 10 NULL 12 Using index
SELECT a, MIN(b), MAX(b), AVG(b) FROM t1 GROUP BY a ORDER BY a DESC;
a MIN(b) MAX(b) AVG(b)
4 1 3 2.0000
3 1 3 2.0000
2 1 3 2.0000
1 1 3 2.0000
DROP TABLE t1;

24
mysql-test/t/group_min_max.test
View file

@ -914,7 +914,31 @@ SELECT SQL_BIG_RESULT DISTINCT(a) FROM t1;
DROP TABLE t1;
#
# Bug #32268: Indexed queries give bogus MIN and MAX results
#
CREATE TABLE t1 (a INT, b INT);
INSERT INTO t1 (a, b) VALUES (1,1), (1,2), (1,3);
INSERT INTO t1 SELECT a + 1, b FROM t1;
INSERT INTO t1 SELECT a + 2, b FROM t1;
EXPLAIN
SELECT a, MIN(b), MAX(b) FROM t1 GROUP BY a ORDER BY a DESC;
SELECT a, MIN(b), MAX(b) FROM t1 GROUP BY a ORDER BY a DESC;
CREATE INDEX break_it ON t1 (a, b);
EXPLAIN
SELECT a, MIN(b), MAX(b) FROM t1 GROUP BY a ORDER BY a;
SELECT a, MIN(b), MAX(b) FROM t1 GROUP BY a ORDER BY a;
EXPLAIN
SELECT a, MIN(b), MAX(b) FROM t1 GROUP BY a ORDER BY a DESC;
SELECT a, MIN(b), MAX(b) FROM t1 GROUP BY a ORDER BY a DESC;
EXPLAIN
SELECT a, MIN(b), MAX(b), AVG(b) FROM t1 GROUP BY a ORDER BY a DESC;
SELECT a, MIN(b), MAX(b), AVG(b) FROM t1 GROUP BY a ORDER BY a DESC;
DROP TABLE t1;

3
sql/sql_select.cc
View file

@ -10570,7 +10570,8 @@ Next_select_func setup_end_select_func(JOIN *join)
/* Set up select_end */
if (table)
{
if (table->group && tmp_tbl->sum_func_count)
if (table->group && tmp_tbl->sum_func_count &&
!tmp_tbl->precomputed_group_by)
{
if (table->s->keys)
{