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Bug #54105 assert in MDL_context::release_locks_stored_before

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The problem was that SHOW CREATE EVENT released all metadata locks
held by the current transaction. This made any exisiting savepoints
invalid, triggering the assert when ROLLBACK TO SAVEPOINT later
was executed.

This patch fixes the problem by making sure SHOW CREATE EVENT only
releases metadata locks acquired by the statement itself.

Test case added to event_trans.test.
This commit is contained in:
Jon Olav Hauglid
2010-08-13 10:02:37 +02:00
parent 7349ddae6f
commit 3bc4d54073
4 changed files with 58 additions and 8 deletions
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19
mysql-test/r/events_trans.result
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@@ -116,3 +116,22 @@ OK: create event: database does not exist
delete from t1;
commit work;
drop database events_test;
#
# Bug#54105 assert in MDL_context::release_locks_stored_before
#
USE test;
DROP TABLE IF EXISTS t1, t2;
DROP EVENT IF EXISTS e1;
CREATE TABLE t1 (a INT) ENGINE=InnoDB;
CREATE TABLE t2 (a INT);
CREATE EVENT e1 ON SCHEDULE EVERY 1 DAY DO SELECT 1;
START TRANSACTION;
INSERT INTO t1 VALUES (1);
SAVEPOINT A;
SHOW CREATE EVENT e1;
Event sql_mode time_zone Create Event character_set_client collation_connection Database Collation
e1 SYSTEM CREATE DEFINER=`root`@`localhost` EVENT `e1` ON SCHEDULE EVERY 1 DAY STARTS '#' ON COMPLETION NOT PRESERVE ENABLE DO SELECT 1 latin1 latin1_swedish_ci latin1_swedish_ci
SELECT * FROM t2;
a
ROLLBACK WORK TO SAVEPOINT A;
DROP TABLE t1, t2;