Eliminate pg_rewrite.ev_attr column and related dead code.

Commit 95ef6a344821655ce4d0a74999ac49dd6af6d342 removed the
ability to create rules on an individual column as of 7.3, but
left some residual code which has since been useless.  This cleans
up that dead code without any change in behavior other than
dropping the useless column from the catalog.

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.