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MDEV-14831 CREATE OR REPLACE SEQUENCE under LOCK TABLE corrupts the sequence, causes ER_KEY_NOT_FOUND The problem was that sequence_insert didn't properly handle the case where there where there was a LOCK TABLE while creating the sequence. Fixed by opening the sequence table, for inserting the first record, in a new environment without any other open tables. Found also a bug in Locked_tables_list::reopen_tables() where the lock structure for the new tables was allocated in THD::mem_root, which causes crashes. This could cause problems with other create tables done under LOCK TABLES.