Bug #5860 Multi-table UPDATE does not activate update triggers

Description:
Multi-table UPDATE does not activate UPDATE triggers.

How to repeat:
USE test;
DROP TABLE IF EXISTS t1, t2;
CREATE TABLE t1 ( a int );
CREATE TABLE t2 LIKE t1;
CREATE TRIGGER tr1 BEFORE UPDATE ON t1 FOR EACH ROW SET new.a=old.a;
INSERT INTO t1 VALUES (1);
INSERT INTO t2 VALUES (1);
UPDATE t1 SET a=101;
SELECT a FROM t1;
UPDATE t1 INNER JOIN t2 USING (a) SET t1.a = t2.a+100;
SELECT a FROM t1;
DROP TABLE t1, t2;

Suggested fix:
n/a

Fixed in 5.0.7

This patch also fixed similar problem for multi-delete.

Noted in 5.0.7 changelog.

A patch for this bug has been committed. After review, it may
be pushed to the relevant source trees for release in the next
version. You can access the patch from:

  http://lists.mysql.com/internals/26506