1 files changed, 0 insertions, 64 deletions
diff --git a/src/backend/rewrite/rewriteManip.c b/src/backend/rewrite/rewriteManip.c
index 6ea91f5b211..b2626f1f44f 100644
--- a/src/backend/rewrite/rewriteManip.c
+++ b/src/backend/rewrite/rewriteManip.c
@@ -858,70 +858,6 @@ rangeTableEntry_used(Node *node, int rt_index, int sublevels_up)
 
 
 /*
- * attribute_used -
- *	Check if a specific attribute number of a RTE is used
- *	somewhere in the query or expression.
- */
-
-typedef struct
-{
-	int			rt_index;
-	int			attno;
-	int			sublevels_up;
-} attribute_used_context;
-
-static bool
-attribute_used_walker(Node *node,
-					  attribute_used_context *context)
-{
-	if (node == NULL)
-		return false;
-	if (IsA(node, Var))
-	{
-		Var		   *var = (Var *) node;
-
-		if (var->varlevelsup == context->sublevels_up &&
-			var->varno == context->rt_index &&
-			var->varattno == context->attno)
-			return true;
-		return false;
-	}
-	if (IsA(node, Query))
-	{
-		/* Recurse into subselects */
-		bool		result;
-
-		context->sublevels_up++;
-		result = query_tree_walker((Query *) node, attribute_used_walker,
-								   (void *) context, 0);
-		context->sublevels_up--;
-		return result;
-	}
-	return expression_tree_walker(node, attribute_used_walker,
-								  (void *) context);
-}
-
-bool
-attribute_used(Node *node, int rt_index, int attno, int sublevels_up)
-{
-	attribute_used_context context;
-
-	context.rt_index = rt_index;
-	context.attno = attno;
-	context.sublevels_up = sublevels_up;
-
-	/*
-	 * Must be prepared to start with a Query or a bare expression tree; if
-	 * it's a Query, we don't want to increment sublevels_up.
-	 */
-	return query_or_expression_tree_walker(node,
-										   attribute_used_walker,
-										   (void *) &context,
-										   0);
-}
-
-
-/*
  * If the given Query is an INSERT ... SELECT construct, extract and
  * return the sub-Query node that represents the SELECT part.  Otherwise
  * return the given Query.