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MDEV-7936: Assertion `!table || table->in_use == _current_thd()' fail…
…ed on parallel replication in optimistic mode Make sure that in parallel replication, we execute wait_for_prior_commit() before setting table->in_use for a temporary table. Otherwise we can end up with two parallel replication worker threads competing with each other for use of a temporary table. Re-factor the use of find_temporary_table() to be able to handle errors in the caller (as wait_for_prior_commit() can return error in case of deadlock kill).
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