If a transactional storage engine does not support gap locks (for example
MyRocks) and a gap lock is being attempted while the transaction isolation
level is either
REPEATABLE READ or
SERIALIZABLE, the following SQL
error will be returned to the client and no actual gap lock will be taken
on the effected rows.
ERROR HY000: Using Gap Lock without full unique key in multi-table or multi-statement transactions is not allowed. You need to either rewrite queries to use all unique key columns in WHERE equal conditions, or rewrite to single-table, single-statement transaction.
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