database/mariadb
1
0
Fork 0
mirror of https://github.com/MariaDB/server.git synced 2025-12-24 11:21:21 +03:00
Code Activity

BUG#35850 "Performance regression in 5.1.23/5.1.24"

Browse Source 
- Disable the "prefer full scan on clustered primary key over full scan
  of any secondary key" rule introduced by BUG#35850.
- Update test results accordingly 
(bk trigger: file this for BUG#35850)


mysql-test/r/innodb.result:
  BUG#35850 "Performance regression in 5.1.23/5.1.24"
  - Update test results
mysql-test/r/innodb_mysql.result:
  BUG#35850 "Performance regression in 5.1.23/5.1.24"
  - Testcase
  - Update test results
mysql-test/r/join_outer_innodb.result:
  BUG#35850 "Performance regression in 5.1.23/5.1.24"
  - Update test results
mysql-test/t/innodb_mysql.test:
  BUG#35850 "Performance regression in 5.1.23/5.1.24"
  - Testcase
sql/sql_select.cc:
  BUG#35850 "Performance regression in 5.1.23/5.1.24"
  - Disable the "prefer full scan on clustered primary key over full scan
    of any secondary key" rule introduced by BUG#35850.
This commit is contained in:
unknown
2008-05-07 09:58:21 +04:00
parent d1361c86e7
commit 87e5098249
5 changed files with 57 additions and 28 deletions
Download Patch File Download Diff File Expand all files Collapse all files

26
mysql-test/r/innodb_mysql.result
View File

@@ -355,13 +355,13 @@ EXPLAIN
SELECT COUNT(*) FROM t2 LEFT JOIN t1 ON t2.fkey = t1.id
WHERE t1.name LIKE 'A%';
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 index PRIMARY,name PRIMARY 4 NULL 3 Using where
1 SIMPLE t1 index PRIMARY,name name 23 NULL 3 Using where; Using index
1 SIMPLE t2 ref fkey fkey 5 test.t1.id 1 Using where; Using index
EXPLAIN
SELECT COUNT(*) FROM t2 LEFT JOIN t1 ON t2.fkey = t1.id
WHERE t1.name LIKE 'A%' OR FALSE;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t2 index NULL PRIMARY 4 NULL 5
1 SIMPLE t2 index NULL fkey 5 NULL 5 Using index
1 SIMPLE t1 eq_ref PRIMARY PRIMARY 4 test.t2.fkey 1 Using where
DROP TABLE t1,t2;
CREATE TABLE t1 (
@@ -1268,11 +1268,11 @@ select_type SIMPLE
table t1
type index
possible_keys NULL
key PRIMARY
key_len 4
key b
key_len 5
ref NULL
rows 3
Extra Using filesort
Extra Using index; Using filesort
SELECT * FROM t1 ORDER BY b ASC, a DESC;
a b
1 1
@@ -1284,11 +1284,11 @@ select_type SIMPLE
table t1
type index
possible_keys NULL
key PRIMARY
key_len 4
key b
key_len 5
ref NULL
rows 3
Extra Using filesort
Extra Using index; Using filesort
SELECT * FROM t1 ORDER BY b DESC, a ASC;
a b
2 2
@@ -1654,3 +1654,13 @@ ALTER TABLE t1 CHANGE id id2 INT;
DROP TABLE t2;
DROP TABLE t1;
End of 5.1 tests
drop table if exists t1, t2, t3;
create table t1(a int);
insert into t1 values (0),(1),(2),(3),(4),(5),(6),(7),(8),(9);
create table t2 (a int, b int, pk int, key(a,b), primary key(pk)) engine=innodb;
insert into t2 select @a:=A.a+10*(B.a + 10*C.a),@a, @a from t1 A, t1 B, t1 C;
this must use key 'a', not PRIMARY:
explain select a from t2 where a=b;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t2 index NULL a 10 NULL # Using where; Using index
drop table t1, t2;