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Allow UNLISTEN in hot-standby mode.
Since LISTEN is (still) disallowed, UNLISTEN must be a no-op in a hot-standby session, and so there's no harm in allowing it. This change allows client code to not worry about whether it's connected to a primary or standby server when performing session-state-reset type activities. (Note that DISCARD ALL, which includes UNLISTEN, was already allowed, making it inconsistent to reject UNLISTEN.) Per discussion, back-patch to all supported versions. Shay Rojansky, reviewed by Mi Tar Discussion: https://postgr.es/m/CADT4RqCf2gA_TJtPAjnGzkC3ZiexfBZiLmA-mV66e4UyuVv8bA@mail.gmail.com
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@@ -619,7 +619,7 @@ standard_ProcessUtility(Node *parsetree,
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{
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UnlistenStmt *stmt = (UnlistenStmt *) parsetree;
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PreventCommandDuringRecovery("UNLISTEN");
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/* we allow UNLISTEN during recovery, as it's a noop */
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CheckRestrictedOperation("UNLISTEN");
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if (stmt->conditionname)
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Async_Unlisten(stmt->conditionname);
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