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Bug#41348: INSERT INTO tbl SELECT * FROM temp_tbl overwrites

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locking type of temp table

The problem is that INSERT INTO .. SELECT FROM .. and CREATE
TABLE .. SELECT FROM a temporary table could inadvertently
overwrite the locking type of the temporary table. The lock
type of temporary tables should be a write lock by default.

The solution is to reset the lock type of temporary tables
back to its default value after they are used in a statement.
This commit is contained in:
Davi Arnaut
2009-01-07 10:11:37 -02:00
parent 645b4862c9
commit dc5a0f4481
5 changed files with 131 additions and 1 deletions
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21
mysql-test/r/innodb_mysql.result
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@ -1767,4 +1767,25 @@ ref NULL
rows 6
Extra Using where; Using index
DROP TABLE foo, bar, foo2;
DROP TABLE IF EXISTS t1,t3,t2;
DROP FUNCTION IF EXISTS f1;
CREATE FUNCTION f1() RETURNS VARCHAR(250)
BEGIN
return 'hhhhhhh' ;
END|
CREATE TABLE t1 (a VARCHAR(20), b VARCHAR(20), c VARCHAR(20)) ENGINE=INNODB;
BEGIN WORK;
CREATE TEMPORARY TABLE t2 (a VARCHAR(20), b VARCHAR(20), c varchar(20)) ENGINE=INNODB;
CREATE TEMPORARY TABLE t3 LIKE t2;
INSERT INTO t1 VALUES ('a','b',NULL),('c','d',NULL),('e','f',NULL);
SET @stmt := CONCAT('INSERT INTO t2 SELECT tbl.a, tbl.b, f1()',' FROM t1 tbl');
PREPARE stmt1 FROM @stmt;
SET @stmt := CONCAT('INSERT INTO t3', ' SELECT * FROM t2');
PREPARE stmt3 FROM @stmt;
EXECUTE stmt1;
COMMIT;
DEALLOCATE PREPARE stmt1;
DEALLOCATE PREPARE stmt3;
DROP TABLE t1,t3,t2;
DROP FUNCTION f1;
End of 5.1 tests