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Applied the fix for bug #51084 taken from a mysql tree.

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This commit is contained in:
Igor Babaev 2010-09-23 11:25:45 -07:00
parent f144eb16ae
commit db37f2db82
3 changed files with 101 additions and 3 deletions
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43
mysql-test/r/join_cache.result
View file

@ -5173,7 +5173,6 @@ a b
2 2
set join_cache_level=default;
drop table t1,t2,t3;
set @@optimizer_switch=@save_optimizer_switch;
#
# Bug #52394: using join buffer for 3 table join with ref access
# LP #623209: and no references to the columns of the middle table
@ -5202,3 +5201,45 @@ a
27
DROP TABLE t1,t2,t3;
set join_cache_level=default;
#
# Bug#51084: Batched key access crashes for SELECT with
# derived table and LEFT JOIN
#
CREATE TABLE t1 (
carrier int,
id int PRIMARY KEY
);
INSERT INTO t1 VALUES (1,11),(1,12),(2,13);
CREATE TABLE t2 (
scan_date int,
package_id int
);
INSERT INTO t2 VALUES (2008,21),(2008,22);
CREATE TABLE t3 (
carrier int PRIMARY KEY,
id int
);
INSERT INTO t3 VALUES (1,31);
CREATE TABLE t4 (
carrier_id int,
INDEX carrier_id(carrier_id)
);
INSERT INTO t4 VALUES (31),(32);
SET join_cache_level=8;
SELECT COUNT(*)
FROM (t2 JOIN t1) LEFT JOIN (t3 JOIN t4 ON t3.id = t4.carrier_id)
ON t3.carrier = t1.carrier;
COUNT(*)
6
EXPLAIN
SELECT COUNT(*)
FROM (t2 JOIN t1) LEFT JOIN (t3 JOIN t4 ON t3.id = t4.carrier_id)
ON t3.carrier = t1.carrier;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t2 ALL NULL NULL NULL NULL 2
1 SIMPLE t1 ALL NULL NULL NULL NULL 3 Using join buffer
1 SIMPLE t3 eq_ref PRIMARY PRIMARY 4 test.t1.carrier 1
1 SIMPLE t4 ref carrier_id carrier_id 5 test.t3.id 2 Using index
SET join_cache_level=default;
DROP TABLE t1,t2,t3,t4;
set @@optimizer_switch=@save_optimizer_switch;

48
mysql-test/t/join_cache.test
View file

@ -1955,8 +1955,6 @@ set join_cache_level=default;
drop table t1,t2,t3;
set @@optimizer_switch=@save_optimizer_switch;
--echo #
--echo # Bug #52394: using join buffer for 3 table join with ref access
--echo # LP #623209: and no references to the columns of the middle table
@ -1984,3 +1982,49 @@ DROP TABLE t1,t2,t3;
set join_cache_level=default;
--echo #
--echo # Bug#51084: Batched key access crashes for SELECT with
--echo # derived table and LEFT JOIN
--echo #
CREATE TABLE t1 (
carrier int,
id int PRIMARY KEY
);
INSERT INTO t1 VALUES (1,11),(1,12),(2,13);
CREATE TABLE t2 (
scan_date int,
package_id int
);
INSERT INTO t2 VALUES (2008,21),(2008,22);
CREATE TABLE t3 (
carrier int PRIMARY KEY,
id int
);
INSERT INTO t3 VALUES (1,31);
CREATE TABLE t4 (
carrier_id int,
INDEX carrier_id(carrier_id)
);
INSERT INTO t4 VALUES (31),(32);
SET join_cache_level=8;
SELECT COUNT(*)
FROM (t2 JOIN t1) LEFT JOIN (t3 JOIN t4 ON t3.id = t4.carrier_id)
ON t3.carrier = t1.carrier;
EXPLAIN
SELECT COUNT(*)
FROM (t2 JOIN t1) LEFT JOIN (t3 JOIN t4 ON t3.id = t4.carrier_id)
ON t3.carrier = t1.carrier;
SET join_cache_level=default;
DROP TABLE t1,t2,t3,t4;
# this must be the last command in the file
set @@optimizer_switch=@save_optimizer_switch;

13
sql/sql_select.cc
View file

@ -7202,6 +7202,19 @@ void set_join_cache_denial(JOIN_TAB *join_tab)
{
if (join_tab->cache)
{
/*
If there is a previous cache linked to this cache through the
next_cache pointer: remove the link.
*/
if (join_tab->cache->prev_cache)
join_tab->cache->prev_cache->next_cache= 0;
/*
No need to do the same for next_cache since cache denial is done
backwards starting from the latest cache in the linked list (see
revise_cache_usage()).
*/
DBUG_ASSERT(!join_tab->cache->next_cache);
join_tab->cache->free();
join_tab->cache= 0;
}