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Certain updates of table joined to self results in unexpected behavior. The problem was that record cache was mistakenly enabled for self-joined table updates. Normally record cache must be disabled for such updates. Fixed wrong condition in code that determines whether to use record cache for self-joined table updates. Only MyISAM tables were affected. mysql-test/r/myisam.result: Test case for BUG#18036. mysql-test/t/myisam.test: Test case for BUG#18036. sql/sql_update.cc: Fixed wrong condition in code that determines whether to use record cache for self-joined table updates.
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