diff --git a/src/backend/nodes/copyfuncs.c b/src/backend/nodes/copyfuncs.c
new file mode 100644
index 25839ee..522d8e1
*** a/src/backend/nodes/copyfuncs.c
--- b/src/backend/nodes/copyfuncs.c
*************** static IndexScan *
*** 367,372 ****
--- 367,373 ----
  _copyIndexScan(const IndexScan *from)
  {
  	IndexScan  *newnode = makeNode(IndexScan);
+ 	int			numOrderbys;
  
  	/*
  	 * copy node superclass fields
*************** _copyIndexScan(const IndexScan *from)
*** 381,386 ****
--- 382,390 ----
  	COPY_NODE_FIELD(indexqualorig);
  	COPY_NODE_FIELD(indexorderby);
  	COPY_NODE_FIELD(indexorderbyorig);
+ 	numOrderbys = list_length(from->indexorderby);
+ 	if (numOrderbys > 0)
+ 		COPY_POINTER_FIELD(indexorderbyops, numOrderbys * sizeof(Oid));
  	COPY_SCALAR_FIELD(indexorderdir);
  
  	return newnode;
diff --git a/src/backend/nodes/outfuncs.c b/src/backend/nodes/outfuncs.c
new file mode 100644
index fe868b8..9b71d2b
*** a/src/backend/nodes/outfuncs.c
--- b/src/backend/nodes/outfuncs.c
*************** _outSeqScan(StringInfo str, const SeqSca
*** 448,453 ****
--- 448,455 ----
  static void
  _outIndexScan(StringInfo str, const IndexScan *node)
  {
+ 	int			numOrderbys, i;
+ 
  	WRITE_NODE_TYPE("INDEXSCAN");
  
  	_outScanInfo(str, (const Scan *) node);
*************** _outIndexScan(StringInfo str, const Inde
*** 457,462 ****
--- 459,471 ----
  	WRITE_NODE_FIELD(indexqualorig);
  	WRITE_NODE_FIELD(indexorderby);
  	WRITE_NODE_FIELD(indexorderbyorig);
+ 
+ 	numOrderbys = list_length(node->indexorderby);
+ 	appendStringInfoString(str, " :indexorderbyops");
+ 	for (i = 0; i < numOrderbys; i++)
+ 		appendStringInfo(str, " %u", node->indexorderbyops[i]);
+ 
+ 	WRITE_NODE_FIELD(indexorderby);
  	WRITE_ENUM_FIELD(indexorderdir, ScanDirection);
  }
  
diff --git a/src/backend/optimizer/plan/createplan.c b/src/backend/optimizer/plan/createplan.c
new file mode 100644
index 783e34b..1b28b4b
*** a/src/backend/optimizer/plan/createplan.c
--- b/src/backend/optimizer/plan/createplan.c
*************** create_indexscan_plan(PlannerInfo *root,
*** 1275,1281 ****
  	 * If there are ORDER BY expressions, look up the sort operators for
  	 * their datatypes.
  	 */
! 	if (best_path->path.pathkeys && indexorderbys)
  	{
  		int			numOrderBys = list_length(indexorderbys);
  		int			i;
--- 1275,1281 ----
  	 * If there are ORDER BY expressions, look up the sort operators for
  	 * their datatypes.
  	 */
! 	if (indexorderbys)
  	{
  		int			numOrderBys = list_length(indexorderbys);
  		int			i;
*************** create_indexscan_plan(PlannerInfo *root,
*** 1285,1290 ****
--- 1285,1293 ----
  		Expr	   *expr;
  		EquivalenceMember *em;
  
+ 		/* indexorderbys should present only simultaneously with pathkeys */
+ 		Assert(best_path->path.pathkeys);
+ 
  		indexorderbyops = (Oid *) palloc(numOrderBys * sizeof(Oid));
  
  		/*