[PATCH] nbtree: Do not show debugmessage if deduplication is disabled

[Justin Pryzby]

Even though the message literally says whether the index "can safely" or
"cannot" use deduplication, the function specifically avoids the debug message
for system columns, so I think it also makes sense to hide it when
deduplication is turned off. 

diff --git a/src/backend/access/nbtree/nbtutils.c 
b/src/backend/access/nbtree/nbtutils.c
index 2f5f14e527..b78b542429 100644
--- a/src/backend/access/nbtree/nbtutils.c
+++ b/src/backend/access/nbtree/nbtutils.c
@@ -2710,6 +2710,9 @@ _bt_allequalimage(Relation rel, bool debugmessage)
        if (IsSystemRelation(rel))
                return false;
 
+       if (!BTGetDeduplicateItems(rel))
+               return false;
+
        for (int i = 0; i < IndexRelationGetNumberOfKeyAttributes(rel); i++)
        {
                Oid                     opfamily = rel->rd_opfamily[i];
-- 
2.17.0