diff --git a/src/backend/optimizer/path/allpaths.c b/src/backend/optimizer/path/allpaths.c
index bd8c7816c4..88b09a2a8b 100644
--- a/src/backend/optimizer/path/allpaths.c
+++ b/src/backend/optimizer/path/allpaths.c
@@ -8,7 +8,7 @@
  *
  *
  * IDENTIFICATION
- *	  $PostgreSQL: pgsql/src/backend/optimizer/path/allpaths.c,v 1.154.2.2 2008/01/11 04:02:25 tgl Exp $
+ *	  $PostgreSQL: pgsql/src/backend/optimizer/path/allpaths.c,v 1.154.2.3 2008/11/11 18:13:54 tgl Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -326,14 +326,12 @@ set_append_rel_pathlist(PlannerInfo *root, RelOptInfo *rel,
 								   appinfo);
 
 		/*
-		 * Copy the parent's attr_needed data as well, with appropriate
-		 * adjustment of relids and attribute numbers.
+		 * Note: we could compute appropriate attr_needed data for the
+		 * child's variables, by transforming the parent's attr_needed
+		 * through the translated_vars mapping.  However, currently there's
+		 * no need because attr_needed is only examined for base relations
+		 * not otherrels.  So we just leave the child's attr_needed empty.
 		 */
-		pfree(childrel->attr_needed);
-		childrel->attr_needed =
-			adjust_appendrel_attr_needed(rel, appinfo,
-										 childrel->min_attr,
-										 childrel->max_attr);
 
 		/*
 		 * Compute the child's access paths, and add the cheapest one to the
diff --git a/src/backend/optimizer/prep/prepunion.c b/src/backend/optimizer/prep/prepunion.c
index 0f77e1d91c..d809084355 100644
--- a/src/backend/optimizer/prep/prepunion.c
+++ b/src/backend/optimizer/prep/prepunion.c
@@ -22,7 +22,7 @@
  *
  *
  * IDENTIFICATION
- *	  $PostgreSQL: pgsql/src/backend/optimizer/prep/prepunion.c,v 1.134.2.1 2007/07/12 18:27:09 tgl Exp $
+ *	  $PostgreSQL: pgsql/src/backend/optimizer/prep/prepunion.c,v 1.134.2.2 2008/11/11 18:13:54 tgl Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -1255,70 +1255,6 @@ adjust_relid_set(Relids relids, Index oldrelid, Index newrelid)
 	return relids;
 }
 
-/*
- * adjust_appendrel_attr_needed
- *		Adjust an attr_needed[] array to reference a member rel instead of
- *		the original appendrel
- *
- * oldrel: source of data (we use the attr_needed, min_attr, max_attr fields)
- * appinfo: supplies parent_relid, child_relid, col_mappings
- * new_min_attr, new_max_attr: desired bounds of new attr_needed array
- *
- * The relid sets are adjusted by substituting child_relid for parent_relid.
- * (NOTE: oldrel is not necessarily the parent_relid relation!)  We are also
- * careful to map attribute numbers within the array properly.	User
- * attributes have to be mapped through col_mappings, but system attributes
- * and whole-row references always have the same attno.
- *
- * Returns a palloc'd array with the specified bounds
- */
-Relids *
-adjust_appendrel_attr_needed(RelOptInfo *oldrel, AppendRelInfo *appinfo,
-							 AttrNumber new_min_attr, AttrNumber new_max_attr)
-{
-	Relids	   *new_attr_needed;
-	Index		parent_relid = appinfo->parent_relid;
-	Index		child_relid = appinfo->child_relid;
-	int			parent_attr;
-	ListCell   *lm;
-
-	/* Create empty result array */
-	new_attr_needed = (Relids *)
-		palloc0((new_max_attr - new_min_attr + 1) * sizeof(Relids));
-	/* Process user attributes, with appropriate attno mapping */
-	parent_attr = 1;
-	foreach(lm, appinfo->col_mappings)
-	{
-		int			child_attr = lfirst_int(lm);
-
-		if (child_attr > 0)
-		{
-			Relids		attrneeded;
-
-			Assert(parent_attr <= oldrel->max_attr);
-			Assert(child_attr <= new_max_attr);
-			attrneeded = oldrel->attr_needed[parent_attr - oldrel->min_attr];
-			attrneeded = adjust_relid_set(attrneeded,
-										  parent_relid, child_relid);
-			new_attr_needed[child_attr - new_min_attr] = attrneeded;
-		}
-		parent_attr++;
-	}
-	/* Process system attributes, including whole-row references */
-	Assert(new_min_attr <= oldrel->min_attr);
-	for (parent_attr = oldrel->min_attr; parent_attr <= 0; parent_attr++)
-	{
-		Relids		attrneeded;
-
-		attrneeded = oldrel->attr_needed[parent_attr - oldrel->min_attr];
-		attrneeded = adjust_relid_set(attrneeded,
-									  parent_relid, child_relid);
-		new_attr_needed[parent_attr - new_min_attr] = attrneeded;
-	}
-
-	return new_attr_needed;
-}
-
 /*
  * Adjust the targetlist entries of an inherited UPDATE operation
  *
diff --git a/src/include/optimizer/prep.h b/src/include/optimizer/prep.h
index 544dc766e8..fd03157391 100644
--- a/src/include/optimizer/prep.h
+++ b/src/include/optimizer/prep.h
@@ -7,7 +7,7 @@
  * Portions Copyright (c) 1996-2006, PostgreSQL Global Development Group
  * Portions Copyright (c) 1994, Regents of the University of California
  *
- * $PostgreSQL: pgsql/src/include/optimizer/prep.h,v 1.57 2006/10/04 00:30:09 momjian Exp $
+ * $PostgreSQL: pgsql/src/include/optimizer/prep.h,v 1.57.2.1 2008/11/11 18:13:54 tgl Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -50,9 +50,4 @@ extern void expand_inherited_tables(PlannerInfo *root);
 
 extern Node *adjust_appendrel_attrs(Node *node, AppendRelInfo *appinfo);
 
-extern Relids *adjust_appendrel_attr_needed(RelOptInfo *oldrel,
-							 AppendRelInfo *appinfo,
-							 AttrNumber new_min_attr,
-							 AttrNumber new_max_attr);
-
 #endif   /* PREP_H */