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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
This commit is contained in:
Tom Lane
2019-01-25 21:14:31 -05:00
parent fbf5395cb1
commit 741ee48900
6 changed files with 16 additions and 10 deletions

View File

@@ -619,7 +619,7 @@ standard_ProcessUtility(Node *parsetree,
{
UnlistenStmt *stmt = (UnlistenStmt *) parsetree;
PreventCommandDuringRecovery("UNLISTEN");
/* we allow UNLISTEN during recovery, as it's a noop */
CheckRestrictedOperation("UNLISTEN");
if (stmt->conditionname)
Async_Unlisten(stmt->conditionname);