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Also it silently makes Slave out of sync in STATEMENT 5.1 replication if tables use different engines on master and slave (Inno DB-Inno DB) Even more problems if ON UPDATE triggers exists in examples above.

Please find one more testcase with identical conclusions (test47453.sql): 1. "Changed:" is not zero only if TIMESTAMP column present in table. Bug has timing issues (in immediate update "Changed:" is reported zero) 4.

********************************************************************************************/ # clean up the tables DELETE FROM linked Table; DELETE FROM test Table; # set up our data elements INSERT INTO linked Table (test Table Id) VALUES (1); INSERT INTO test Table (id,data) VALUES (1,'original data'); SELECT * FROM linked Table LEFT JOIN test Table ON test Table Id=id; # Do an update to test Table linked to linked Table which should not change anything UPDATE linked Table LEFT JOIN test Table ON test Table Id=id SET data='original data' WHERE id=1; SELECT * FROM linked Table LEFT JOIN test Table ON test Table Id=id; /************* * COPY 3 END *************/ /* * Wait at least 1 second */ /******************************************************************************************** * COPY 4 START ********************************************************************************************/ # Do an update to test Table linked to linked Table which should not change anything UPDATE linked Table LEFT JOIN test Table ON test Table Id=id SET data='original data' WHERE id=1; SELECT * FROM linked Table LEFT JOIN test Table ON test Table Id=id; /************* * COPY 4 END *************/ /* * Notes.* * Up to this point, the update seems to be working as advertised.We are updating a row, * but we are updating it with a value which does not change the value of anything in the row.Here is the the smallest testcase, (but I advise review all other testcases because they demonstrate complex conditions for the problem).CREATE TABLE linked Table (test Table Id INT) ENGINE = INNODB; CREATE TABLE test Table (id INT, data CHAR(50), timestamp TIMESTAMP(14) ) ENGINE = INNODB; INSERT INTO linked Table (test Table Id) VALUES (1); INSERT INTO test Table (id,data) VALUES (1,'original data'); select * from linked Table; select sleep(1); UPDATE linked Table JOIN test Table ON test Table Id=id SET data='original data' WHERE id=1; select * from linked Table; A patch for this bug has been committed.

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