[pull] master from postgres:master #1191
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Address a potential SIGSEGV that may occur when the tablesync worker attempts to locate a deleted row while applying changes. This situation arises during conflict detection for update-deleted scenarios. To prevent this crash, ensure that the operation is errored out early if the leader apply worker is unavailable. Since the leader worker maintains the necessary conflict detection metadata, proceeding without it serves no purpose and risks reporting incorrect conflict type. In the passing, improve a nearby comment. Reported by Tom Lane as per Coverity Author: shveta malik <shveta.malik@gmail.com> Reviewed-by: Amit Kapila <amit.kapila16@gmail.com> Discussion: https://postgr.es/m/334468.1757280992@sss.pgh.pa.us
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