Allow using worker_read_action for locking before processing the job
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It fixes the problem with PostgreSQL being unable to lock a record in a case when given `read_action` includes `distinct` statement. It fails because database engine is not capable of locking "for update" when providing `distinct`.
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It fixes the problem with PostgreSQL being unable to lock a record in a case when given
read_actionincludesdistinctstatement. It fails because database engine is not capable of locking "for update" when providingdistinct.Contributor checklist