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Bug#14397 - OPTIMIZE TABLE with an open HANDLER causes a crash
Version for 4.0. It fixes two problems: 1. The cause of the bug was that we did not check the table version for the HANDLER ... READ commands. We did not notice when a table was replaced by a new one. This can happen during ALTER TABLE, REPAIR TABLE, and OPTIMIZE TABLE (there might be more cases). I call the fix for this problem "the primary bug fix". 2. mysql_ha_flush() was not always called with a locked LOCK_open. Though the function comment clearly said it must. I changed the code so that the locking is done when required. I call the fix for this problem "the secondary fix".
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@ -217,7 +217,7 @@ void THD::cleanup(void)
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close_thread_tables(this);
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}
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mysql_ha_flush(this, (TABLE_LIST*) 0,
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MYSQL_HA_CLOSE_FINAL | MYSQL_HA_FLUSH_ALL);
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MYSQL_HA_CLOSE_FINAL | MYSQL_HA_FLUSH_ALL, FALSE);
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hash_free(&handler_tables_hash);
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close_temporary_tables(this);
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hash_free(&user_vars);
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