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720e9bd5be
Cause: * when autocommit=0 (or transaction is issued by user), `ha_commit_trans` is called twice on ALTER TABLE, causing a duplicated insert into `transaction_registry` (ER_DUP_ENTRY). Solution: * ALTER TABLE makes an implicit commit by a second call. We actually need to make an insert only when it is a real commit. So is_real variable is additionally checked.