From 27a4f06adee023d9172abaf128e35e3cc068108a Mon Sep 17 00:00:00 2001
From: Tom Lane <tgl@sss.pgh.pa.us>
Date: Fri, 2 Apr 2004 19:07:02 +0000
Subject: Get rid of crocky use of RangeVar nodes in parser to represent
 partially transformed whole-row variables.  Cleaner to use regular whole-row
 Vars.

---
 src/backend/parser/parse_relation.c | 24 ++++++++++++++++++++----
 1 file changed, 20 insertions(+), 4 deletions(-)

(limited to 'src/backend/parser/parse_relation.c')

diff --git a/src/backend/parser/parse_relation.c b/src/backend/parser/parse_relation.c
index 3e314bea963..4df92ee310c 100644
--- a/src/backend/parser/parse_relation.c
+++ b/src/backend/parser/parse_relation.c
@@ -8,7 +8,7 @@
  *
  *
  * IDENTIFICATION
- *	  $PostgreSQL: pgsql/src/backend/parser/parse_relation.c,v 1.92 2004/01/14 23:01:55 tgl Exp $
+ *	  $PostgreSQL: pgsql/src/backend/parser/parse_relation.c,v 1.93 2004/04/02 19:06:58 tgl Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -41,8 +41,6 @@ static Node *scanNameSpaceForRelid(ParseState *pstate, Node *nsnode,
 					  Oid relid);
 static void scanNameSpaceForConflict(ParseState *pstate, Node *nsnode,
 						 RangeTblEntry *rte1, const char *aliasname1);
-static Node *scanRTEForColumn(ParseState *pstate, RangeTblEntry *rte,
-				 char *colname);
 static bool isForUpdate(ParseState *pstate, char *refname);
 static bool get_rte_attribute_is_dropped(RangeTblEntry *rte,
 							 AttrNumber attnum);
@@ -424,6 +422,24 @@ RTERangeTablePosn(ParseState *pstate, RangeTblEntry *rte, int *sublevels_up)
 	return 0;					/* keep compiler quiet */
 }
 
+/*
+ * Given an RT index and nesting depth, find the corresponding RTE.
+ * This is the inverse of RTERangeTablePosn.
+ */
+RangeTblEntry *
+GetRTEByRangeTablePosn(ParseState *pstate,
+					   int varno,
+					   int sublevels_up)
+{
+	while (sublevels_up-- > 0)
+	{
+		pstate = pstate->parentParseState;
+		Assert(pstate != NULL);
+	}
+	Assert(varno > 0 && varno <= length(pstate->p_rtable));
+	return rt_fetch(varno, pstate->p_rtable);
+}
+
 /*
  * scanRTEForColumn
  *	  Search the column names of a single RTE for the given name.
@@ -439,7 +455,7 @@ RTERangeTablePosn(ParseState *pstate, RangeTblEntry *rte, int *sublevels_up)
  * expression can only appear in a FROM clause, and any table named in
  * FROM will be marked as requiring read access from the beginning.
  */
-static Node *
+Node *
 scanRTEForColumn(ParseState *pstate, RangeTblEntry *rte, char *colname)
 {
 	Node	   *result = NULL;
-- 
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