From 9ee4d06f3fdde37b063b8a0f0fa0a2113ac12303 Mon Sep 17 00:00:00 2001
From: Heikki Linnakangas
Date: Thu, 17 Jan 2013 16:35:46 +0200
Subject: Make GiST indexes on-disk compatible with 9.2 again.

The patch that turned XLogRecPtr into a uint64 inadvertently changed the
on-disk format of GiST indexes, because the NSN field in the GiST page
opaque is an XLogRecPtr. That breaks pg_upgrade. Revert the format of that
field back to the two-field struct that XLogRecPtr was before. This is the
same we did to LSNs in the page header to avoid changing on-disk format.

Bump catversion, as this invalidates any existing GiST indexes built on
9.3devel.
---
 src/backend/access/gist/gistget.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

(limited to 'src/backend/access/gist/gistget.c')

diff --git a/src/backend/access/gist/gistget.c b/src/backend/access/gist/gistget.c
index 79996a235f..3300fec644 100644
--- a/src/backend/access/gist/gistget.c
+++ b/src/backend/access/gist/gistget.c
@@ -263,7 +263,7 @@ gistScanPage(IndexScanDesc scan, GISTSearchItem *pageItem, double *myDistances,
 	 */
 	if (!XLogRecPtrIsInvalid(pageItem->data.parentlsn) &&
 		(GistFollowRight(page) ||
-		 pageItem->data.parentlsn < opaque->nsn) &&
+		 pageItem->data.parentlsn < GistPageGetNSN(page)) &&
 		opaque->rightlink != InvalidBlockNumber /* sanity check */ )
 	{
 		/* There was a page split, follow right link to add pages */
-- 
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