[pull] master from postgres:master #998
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ca307d5 made CheckPointReplicationSlots() unconditionally call ReplicationSlotsComputeRequiredLSN(). It causes an assertion trap when max_replication_slots equals 0. This commit makes CheckPointReplicationSlots() call ReplicationSlotsComputeRequiredLSN() only when at least one slot gets its last_saved_restart_lsn updated. That avoids an assert trap and also saves some cycles when no one slot has last_saved_restart_lsn updated. Based on ideas from Dilip Kumar <[email protected]> and Hayato Kuroda <[email protected]>. Reported-by: Zhijie Hou <[email protected]> Discussion: https://postgr.es/m/OS0PR01MB5716BB506AF934376FF3A8BB947BA%40OS0PR01MB5716.jpnprd01.prod.outlook.com
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