From a5021b435e1939cda132226ded8b435af1d9f603 Mon Sep 17 00:00:00 2001
From: Derek Nelson <=>
Date: Sat, 28 May 2016 18:50:33 -0700
Subject: [PATCH] Fixes #1400: Only initialize set_agg uniqueness state when it
 doesn't exist yet

---
 src/backend/utils/adt/setfuncs.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/backend/utils/adt/setfuncs.c b/src/backend/utils/adt/setfuncs.c
index baee24593..504219378 100644
--- a/src/backend/utils/adt/setfuncs.c
+++ b/src/backend/utils/adt/setfuncs.c
@@ -196,7 +196,7 @@ set_agg_combine(PG_FUNCTION_ARGS)
 
 	old = MemoryContextSwitchTo(context);
 
-	if (state == NULL)
+	if (fcinfo->flinfo->fn_extra == NULL)
 		set_agg_startup(fcinfo, incoming->element_type);
 
 	/*