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Since the old logic was completely unaware of subtransactions, a change made in a subsequently-aborted subtransaction would still cause workers to be stopped at toplevel transaction commit. Fix that by managing a stack of worker lists rather than just one. Amit Khandekar and Robert Haas Discussion: http://postgr.es/m/CAJ3gD9eaG_mWqiOTA2LfAug-VRNn1hrhf50Xi1YroxL37QkZNg@mail.gmail.com