From fab177e64f44fcad40c88903a903fd981a8bd2cb Mon Sep 17 00:00:00 2001
From: Bruce Momjian <bruce@momjian.us>
Date: Fri, 12 Aug 2005 21:42:53 +0000
Subject: Improve documention on loading large data sets into plperl.

David Fetter
---
 src/backend/storage/buffer/bufmgr.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

(limited to 'src')

diff --git a/src/backend/storage/buffer/bufmgr.c b/src/backend/storage/buffer/bufmgr.c
index 6243f2481e4..9cd9ed2112c 100644
--- a/src/backend/storage/buffer/bufmgr.c
+++ b/src/backend/storage/buffer/bufmgr.c
@@ -8,7 +8,7 @@
  *
  *
  * IDENTIFICATION
- *	  $PostgreSQL: pgsql/src/backend/storage/buffer/bufmgr.c,v 1.193 2005/08/12 05:05:50 tgl Exp $
+ *	  $PostgreSQL: pgsql/src/backend/storage/buffer/bufmgr.c,v 1.194 2005/08/12 21:42:53 momjian Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -153,6 +153,8 @@ ReadBuffer(Relation reln, BlockNumber blockNum)
 		 * block is not currently in memory.
 		 */
 		bufHdr = BufferAlloc(reln, blockNum, &found);
+		/* we are guaranted that nobody else has touched this will-be-new block */
+		Assert(!(found && isExtend));
 		if (found)
 			BufferHitCount++;
 	}
-- 
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