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Merge olga.mysql.com:/home/igor/mysql-5.0-opt

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into  olga.mysql.com:/home/igor/dev-opt/mysql-5.0-opt-bug25602


sql/sql_select.cc:
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2007-06-24 10:50:24 -07:00
parent fec835f1eb e009b764b9
commit f30db30991
3 changed files with 49 additions and 2 deletions
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21
mysql-test/r/group_min_max.result
View File

@@ -2286,3 +2286,24 @@ Variable_name Value
Handler_read_key 8
Handler_read_next 1
DROP TABLE t1,t2,t3;
CREATE TABLE t1 (a int, INDEX idx(a));
INSERT INTO t1 VALUES
(4), (2), (1), (2), (4), (2), (1), (4),
(4), (2), (1), (2), (2), (4), (1), (4);
EXPLAIN SELECT DISTINCT(a) FROM t1;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range NULL idx 5 NULL 9 Using index for group-by
SELECT DISTINCT(a) FROM t1;
a
1
2
4
EXPLAIN SELECT SQL_BIG_RESULT DISTINCT(a) FROM t1;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range NULL idx 5 NULL 9 Using index for group-by
SELECT SQL_BIG_RESULT DISTINCT(a) FROM t1;
a
1
2
4
DROP TABLE t1;

22
mysql-test/t/group_min_max.test
View File

@@ -870,3 +870,25 @@ DELETE FROM t3 WHERE (SELECT (SELECT MAX(b) FROM t1 GROUP BY a HAVING a < 2) x
SHOW STATUS LIKE 'handler_read__e%';
DROP TABLE t1,t2,t3;
#
# Bug#25602: queries with DISTINCT and SQL_BIG_RESULT hint
# for which loose scan optimization is applied
#
CREATE TABLE t1 (a int, INDEX idx(a));
INSERT INTO t1 VALUES
(4), (2), (1), (2), (4), (2), (1), (4),
(4), (2), (1), (2), (2), (4), (1), (4);
EXPLAIN SELECT DISTINCT(a) FROM t1;
SELECT DISTINCT(a) FROM t1;
EXPLAIN SELECT SQL_BIG_RESULT DISTINCT(a) FROM t1;
SELECT SQL_BIG_RESULT DISTINCT(a) FROM t1;
DROP TABLE t1;

8
sql/sql_select.cc
View File

@@ -12551,10 +12551,14 @@ create_sort_index(THD *thd, JOIN *join, ORDER *order,
/*
When there is SQL_BIG_RESULT do not sort using index for GROUP BY,
and thus force sorting on disk.
and thus force sorting on disk unless a group min-max optimization
is going to be used as it is applied now only for one table queries
with covering indexes.
*/
if ((order != join->group_list ||
!(join->select_options & SELECT_BIG_RESULT)) &&
!(join->select_options & SELECT_BIG_RESULT) ||
select && select->quick &&
select->quick->get_type() == QUICK_SELECT_I::QS_TYPE_GROUP_MIN_MAX) &&
test_if_skip_sort_order(tab,order,select_limit,0))
DBUG_RETURN(0);
for (ORDER *ord= join->order; ord; ord= ord->next)