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GIN's ItemPointerIsMin, ItemPointerIsMax, and ItemPointerIsLossyPage macros

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should use GinItemPointerGetBlockNumber/GinItemPointerGetOffsetNumber,
not ItemPointerGetBlockNumber/ItemPointerGetOffsetNumber, because the latter
will Assert() on ip_posid == 0, ie a "Min" pointer.  (Thus, ItemPointerIsMin
has never worked at all, but it seems unused at present.)  I'm not certain
that the case can occur in normal functioning, but it's blowing up on me
while investigating Tatsuo-san's data corruption problem.  In any case it
seems like a problem waiting to bite someone.

Back-patch just in case this really is a problem for somebody in the field.
This commit is contained in:
Tom Lane 2009-06-05 18:50:47 +00:00
parent 8b78428fc0
commit 52f0fc703f
1 changed files with 7 additions and 7 deletions
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14
src/include/access/gin.h
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@ -4,7 +4,7 @@
*
* Copyright (c) 2006-2009, PostgreSQL Global Development Group
*
* $PostgreSQL: pgsql/src/include/access/gin.h,v 1.31 2009/03/25 22:19:01 tgl Exp $
* $PostgreSQL: pgsql/src/include/access/gin.h,v 1.32 2009/06/05 18:50:47 tgl Exp $
*--------------------------------------------------------------------------
*/
#ifndef GIN_H
@ -124,18 +124,18 @@ typedef struct GinMetaPageData
#define ItemPointerSetMin(p) \
ItemPointerSet((p), (BlockNumber)0, (OffsetNumber)0)
#define ItemPointerIsMin(p) \
(ItemPointerGetOffsetNumber(p) == (OffsetNumber)0 && \
ItemPointerGetBlockNumber(p) == (BlockNumber)0)
(GinItemPointerGetOffsetNumber(p) == (OffsetNumber)0 && \
GinItemPointerGetBlockNumber(p) == (BlockNumber)0)
#define ItemPointerSetMax(p) \
ItemPointerSet((p), InvalidBlockNumber, (OffsetNumber)0xffff)
#define ItemPointerIsMax(p) \
(ItemPointerGetOffsetNumber(p) == (OffsetNumber)0xffff && \
ItemPointerGetBlockNumber(p) == InvalidBlockNumber)
(GinItemPointerGetOffsetNumber(p) == (OffsetNumber)0xffff && \
GinItemPointerGetBlockNumber(p) == InvalidBlockNumber)
#define ItemPointerSetLossyPage(p, b) \
ItemPointerSet((p), (b), (OffsetNumber)0xffff)
#define ItemPointerIsLossyPage(p) \
(ItemPointerGetOffsetNumber(p) == (OffsetNumber)0xffff && \
ItemPointerGetBlockNumber(p) != InvalidBlockNumber)
(GinItemPointerGetOffsetNumber(p) == (OffsetNumber)0xffff && \
GinItemPointerGetBlockNumber(p) != InvalidBlockNumber)
typedef struct
{