From ec4be2ee6827b6bd85e0813c7a8993cfbb0e6fa7 Mon Sep 17 00:00:00 2001
From: Tom Lane
Date: Fri, 12 Feb 2010 17:33:21 +0000
Subject: Extend the set of frame options supported for window functions.

This patch allows the frame to start from CURRENT ROW (in either RANGE or
ROWS mode), and it also adds support for ROWS n PRECEDING and ROWS n FOLLOWING
start and end points.  (RANGE value PRECEDING/FOLLOWING isn't there yet ---
the grammar works, but that's all.)

Hitoshi Harada, reviewed by Pavel Stehule
---
 src/backend/parser/parse_agg.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

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

diff --git a/src/backend/parser/parse_agg.c b/src/backend/parser/parse_agg.c
index 9b01047b91c..e883e283e0b 100644
--- a/src/backend/parser/parse_agg.c
+++ b/src/backend/parser/parse_agg.c
@@ -8,7 +8,7 @@
  *
  *
  * IDENTIFICATION
- *	  $PostgreSQL: pgsql/src/backend/parser/parse_agg.c,v 1.90 2010/01/02 16:57:49 momjian Exp $
+ *	  $PostgreSQL: pgsql/src/backend/parser/parse_agg.c,v 1.91 2010/02/12 17:33:20 tgl Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -258,7 +258,9 @@ transformWindowFuncCall(ParseState *pstate, WindowFunc *wfunc,
 				continue;
 			if (equal(refwin->partitionClause, windef->partitionClause) &&
 				equal(refwin->orderClause, windef->orderClause) &&
-				refwin->frameOptions == windef->frameOptions)
+				refwin->frameOptions == windef->frameOptions &&
+				equal(refwin->startOffset, windef->startOffset) &&
+				equal(refwin->endOffset, windef->endOffset))
 			{
 				/* found a duplicate window specification */
 				wfunc->winref = winref;
@@ -505,6 +507,7 @@ parseCheckWindowFuncs(ParseState *pstate, Query *qry)
 						 parser_errposition(pstate,
 											locate_windowfunc(expr))));
 		}
+		/* startOffset and limitOffset were checked in transformFrameOffset */
 	}
 }
 
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