Fix possible duplicate tuples while GiST scan. Now page is processed

at once and ItemPointers are collected in memory.

Remove tuple's killing by killtuple() if tuple was moved to another
page - it could produce unaceptable overhead.

Backpatch up to 8.1 because the bug was introduced by GiST's concurrency support.

1 files changed, 8 insertions, 1 deletions

diff --git a/src/include/access/gist_private.h b/src/include/access/gist_private.h
index 1cfa5b92bc2..c1861180d24 100644
--- a/src/include/access/gist_private.h
+++ b/src/include/access/gist_private.h
@@ -7,7 +7,7 @@
  * Portions Copyright (c) 1996-2005, PostgreSQL Global Development Group
  * Portions Copyright (c) 1994, Regents of the University of California
  *
- * $PostgreSQL: pgsql/src/include/access/gist_private.h,v 1.8 2005/10/15 02:49:42 momjian Exp $
+ * $PostgreSQL: pgsql/src/include/access/gist_private.h,v 1.8.2.1 2008/08/23 10:43:58 teodor Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -73,6 +73,13 @@ typedef struct GISTScanOpaqueData
 	MemoryContext tempCxt;
 	Buffer		curbuf;
 	Buffer		markbuf;
+
+	ItemPointerData pageData[BLCKSZ/sizeof(IndexTupleData)];
+	OffsetNumber    nPageData;
+	OffsetNumber    curPageData;
+	ItemPointerData markPageData[BLCKSZ/sizeof(IndexTupleData)];
+	OffsetNumber    markNPageData;
+	OffsetNumber    markCurPageData;
 } GISTScanOpaqueData;
 
 typedef GISTScanOpaqueData *GISTScanOpaque;