1 files changed, 0 insertions, 131 deletions
diff --git a/src/backend/optimizer/path/mergeutils.c b/src/backend/optimizer/path/mergeutils.c
deleted file mode 100644
index 1cc19693f8d..00000000000
--- a/src/backend/optimizer/path/mergeutils.c
+++ /dev/null
@@ -1,131 +0,0 @@
-/*-------------------------------------------------------------------------
- *
- * mergeutils.c
- *	  Utilities for finding applicable merge clauses and pathkeys
- *
- * Copyright (c) 1994, Regents of the University of California
- *
- *
- * IDENTIFICATION
- *	  $Header: /cvsroot/pgsql/src/backend/optimizer/path/Attic/mergeutils.c,v 1.24 1999/07/16 04:59:15 momjian Exp $
- *
- *-------------------------------------------------------------------------
- */
-#include "postgres.h"
-
-
-#include "optimizer/clauses.h"
-#include "optimizer/ordering.h"
-#include "optimizer/paths.h"
-
-/*
- * group_clauses_by_order
- *	  If a join clause node in 'restrictinfo_list' is mergejoinable, store
- *	  it within a mergeinfo node containing other clause nodes with the same
- *	  mergejoin ordering.
- *
- * XXX This is completely braindead: there is no reason anymore to segregate
- * mergejoin clauses by join operator, since the executor can handle mergejoin
- * clause sets with different operators in them.  Instead, we ought to be
- * building a MergeInfo for each potentially useful ordering of the input
- * relations.  But right now the optimizer's internal data structures do not
- * support that (MergeInfo can only store one MergeOrder for a set of clauses).
- * Something to fix next time...
- *
- * 'restrictinfo_list' is the list of restrictinfo nodes
- * 'inner_relids' is the list of relids in the inner join relation
- *	 (used to determine whether a join var is inner or outer)
- *
- * Returns the new list of mergeinfo nodes.
- *
- */
-List *
-group_clauses_by_order(List *restrictinfo_list,
-					   Relids inner_relids)
-{
-	List	   *mergeinfo_list = NIL;
-	List	   *xrestrictinfo;
-
-	foreach(xrestrictinfo, restrictinfo_list)
-	{
-		RestrictInfo *restrictinfo = (RestrictInfo *) lfirst(xrestrictinfo);
-		MergeOrder *merge_ordering = restrictinfo->mergejoinorder;
-
-		if (merge_ordering)
-		{
-
-			/*
-			 * Create a new mergeinfo node and add it to 'mergeinfo_list'
-			 * if one does not yet exist for this merge ordering.
-			 */
-			Expr	   *clause = restrictinfo->clause;
-			Var		   *leftop = get_leftop(clause);
-			Var		   *rightop = get_rightop(clause);
-			PathOrder  *pathorder;
-			MergeInfo  *xmergeinfo;
-			JoinKey    *jmkeys;
-
-			pathorder = makeNode(PathOrder);
-			pathorder->ordtype = MERGE_ORDER;
-			pathorder->ord.merge = merge_ordering;
-			xmergeinfo = match_order_mergeinfo(pathorder, mergeinfo_list);
-			jmkeys = makeNode(JoinKey);
-			if (intMember(leftop->varno, inner_relids))
-			{
-				jmkeys->outer = rightop;
-				jmkeys->inner = leftop;
-			}
-			else
-			{
-				jmkeys->outer = leftop;
-				jmkeys->inner = rightop;
-			}
-
-			if (xmergeinfo == NULL)
-			{
-				xmergeinfo = makeNode(MergeInfo);
-				xmergeinfo->m_ordering = merge_ordering;
-				mergeinfo_list = lcons(xmergeinfo, mergeinfo_list);
-			}
-
-			xmergeinfo->jmethod.clauses = lcons(clause,
-											xmergeinfo->jmethod.clauses);
-			xmergeinfo->jmethod.jmkeys = lcons(jmkeys,
-											 xmergeinfo->jmethod.jmkeys);
-		}
-	}
-	return mergeinfo_list;
-}
-
-
-/*
- * match_order_mergeinfo
- *	  Searches the list 'mergeinfo_list' for a mergeinfo node whose order
- *	  field equals 'ordering'.
- *
- * Returns the node if it exists.
- *
- */
-MergeInfo  *
-match_order_mergeinfo(PathOrder *ordering, List *mergeinfo_list)
-{
-	MergeOrder *xmergeorder;
-	List	   *xmergeinfo = NIL;
-
-	foreach(xmergeinfo, mergeinfo_list)
-	{
-		MergeInfo  *mergeinfo = (MergeInfo *) lfirst(xmergeinfo);
-
-		xmergeorder = mergeinfo->m_ordering;
-
-		if ((ordering->ordtype == MERGE_ORDER &&
-			 equal_merge_ordering(ordering->ord.merge, xmergeorder)) ||
-			(ordering->ordtype == SORTOP_ORDER &&
-		   equal_path_merge_ordering(ordering->ord.sortop, xmergeorder)))
-		{
-
-			return mergeinfo;
-		}
-	}
-	return (MergeInfo *) NIL;
-}