diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index f46af41b56..089e9f1b20 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -773,9 +773,6 @@ DefineRelation(CreateStmt *stmt, char relkind, Oid ownerId,
 										  InvalidOid,
 										  typaddress);
 
-	/* Store inheritance information for new rel. */
-	StoreCatalogInheritance(relationId, inheritOids, stmt->partbound != NULL);
-
 	/*
 	 * We must bump the command counter to make the newly-created relation
 	 * tuple visible for opening.
@@ -869,6 +866,9 @@ DefineRelation(CreateStmt *stmt, char relkind, Oid ownerId,
 		heap_close(parent, NoLock);
 	}
 
+	/* Store inheritance information for new rel. */
+	StoreCatalogInheritance(relationId, inheritOids, stmt->partbound != NULL);
+
 	/*
 	 * Process the partitioning specification (if any) and store the partition
 	 * key information into the catalog.
diff --git a/src/backend/utils/cache/partcache.c b/src/backend/utils/cache/partcache.c
index 115a9fe78f..e3cd65b33a 100644
--- a/src/backend/utils/cache/partcache.c
+++ b/src/backend/utils/cache/partcache.c
@@ -302,19 +302,6 @@ RelationBuildPartitionDesc(Relation rel)
 		if (!HeapTupleIsValid(tuple))
 			elog(ERROR, "cache lookup failed for relation %u", inhrelid);
 
-		/*
-		 * It is possible that the pg_class tuple of a partition has not been
-		 * updated yet to set its relpartbound field.  The only case where
-		 * this happens is when we open the parent relation to check using its
-		 * partition descriptor that a new partition's bound does not overlap
-		 * some existing partition.
-		 */
-		if (!((Form_pg_class) GETSTRUCT(tuple))->relispartition)
-		{
-			ReleaseSysCache(tuple);
-			continue;
-		}
-
 		datum = SysCacheGetAttr(RELOID, tuple,
 								Anum_pg_class_relpartbound,
 								&isnull);