Monty c53aab974b Added syntax and implementation for BACKUP STAGE's ...

Part of MDEV-5336 Implement LOCK FOR BACKUP

- Changed check of Global_only_lock to also include BACKUP lock.
- We store latest MDL_BACKUP_DDL lock in thd->mdl_backup_ticket to be able
  to downgrade lock during copy_data_between_tables()

2018-12-09 22:12:27 +02:00

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