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Perform less setup work for AFTER triggers at transaction start.
Testing reveals that the memory allocation we do at transaction starthas small but measurable overhead on simple transactions. To cutdown on that overhead, defer some of that work to the point whenAFTER triggers are first used, thus avoiding it altogether if theynever are.Patch by me. Review by Andres Freund.1 parentefbbbbc commit2781b4b
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