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Dept of second thoughts: after studying index_getnext() a bit more I realize

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that it can scribble on scan->xs_ctup.t_self while following HOT chains,
so we can't rely on that to stay valid between hashgettuple() calls.
Introduce a private variable in HashScanOpaque, instead.
This commit is contained in:
Tom Lane
2009-11-01 22:30:54 +00:00
parent c4afdca4c2
commit 7d535ebe5b
3 changed files with 16 additions and 8 deletions
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7
src/include/access/hash.h
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@@ -7,7 +7,7 @@
* Portions Copyright (c) 1996-2009, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/include/access/hash.h,v 1.94 2009/11/01 21:25:25 tgl Exp $
* $PostgreSQL: pgsql/src/include/access/hash.h,v 1.95 2009/11/01 22:30:54 tgl Exp $
*
* NOTES
* modeled after Margo Seltzer's hash implementation for unix.
@@ -99,8 +99,11 @@ typedef struct HashScanOpaqueData
*/
Buffer hashso_curbuf;
/* Current position of the scan */
/* Current position of the scan, as an index TID */
ItemPointerData hashso_curpos;
/* Current position of the scan, as a heap TID */
ItemPointerData hashso_heappos;
} HashScanOpaqueData;
typedef HashScanOpaqueData *HashScanOpaque;