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The functions LockTuple, ConditionalLockTuple, UnlockTuple, and XactLockTableWait take an ItemPointer argument that they do not modify, so the argument can be const-qualified to better convey intent and allow the compiler to enforce immutability. Author: Chao Li <li.evan.chao@gmail.com> Discussion: https://www.postgresql.org/message-id/flat/CAEoWx2m9e4rECHBwpRE4%2BGCH%2BpbYZXLh2f4rB1Du5hDfKug%2BOg%40mail.gmail.com