config root man

--echo #
--echo # Bug #47453: InnoDB incorrectly changes TIMESTAMP columns when
--echo #  JOINed during an UPDATE
--echo #

CREATE TABLE t1 (d INT) ENGINE=InnoDB;
CREATE TABLE t2 (a INT, b INT,
  c TIMESTAMP(6) NOT NULL DEFAULT CURRENT_TIMESTAMP(6)
  ON UPDATE CURRENT_TIMESTAMP(6)) ENGINE=InnoDB;

--echo # set up our data elements
INSERT INTO t1 (d) VALUES (1);
INSERT INTO t2 (a,b) VALUES (1,1);
SELECT c INTO @bug47453 FROM t2;

SELECT c!=@bug47453 FROM t1 JOIN t2 ON d=a;
UPDATE t1 JOIN t2 ON d=a SET b=1 WHERE a=1;
SELECT c!=@bug47453 FROM t1 JOIN t2 ON d=a;
UPDATE t1 JOIN t2 ON d=a SET b=1;
--echo # should be 0
SELECT c!=@bug47453 FROM t1 JOIN t2 ON d=a;
UPDATE t1 JOIN t2 ON d=a SET b=2;
--echo # should not be 0
SELECT c!=@bug47453 FROM t1 JOIN t2 ON d=a;

DROP TABLE t1, t2;