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nexedi
MariaDB
Commits
903387af
Commit
903387af
authored
Sep 27, 2006
by
gkodinov/kgeorge@macbook.gmz
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Bug #21174: Index degrades sort performance and optimizer does not honor IGNORE INDEX
- reversed the patch for 5.0 and moved to 5.1
parent
542cdbbc
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-23
mysql-test/r/group_by.result
mysql-test/r/group_by.result
+0
-9
mysql-test/t/group_by.test
mysql-test/t/group_by.test
+0
-12
sql/sql_select.cc
sql/sql_select.cc
+0
-2
No files found.
mysql-test/r/group_by.result
View file @
903387af
...
...
@@ -821,12 +821,3 @@ 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;
mysql-test/t/group_by.test
View file @
903387af
...
...
@@ -655,15 +655,3 @@ 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
;
sql/sql_select.cc
View file @
903387af
...
...
@@ -11735,8 +11735,6 @@ test_if_skip_sort_order(JOIN_TAB *tab,ORDER *order,ha_rows select_limit,
We must not try to use disabled keys.
*/
usable_keys
=
table
->
s
->
keys_in_use
;
/* we must not consider keys that are disabled by IGNORE INDEX */
usable_keys
.
intersect
(
table
->
keys_in_use_for_query
);
for
(
ORDER
*
tmp_order
=
order
;
tmp_order
;
tmp_order
=
tmp_order
->
next
)
{
...
...
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