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Commitaf59a06

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committed
Remove useless mark/restore support in hash index AM, per discussion.
(I'm leaving GiST/GIN cleanup to Teodor.)
1 parent3e00496 commitaf59a06

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2 files changed

+12
-58
lines changed

2 files changed

+12
-58
lines changed

‎src/backend/access/hash/hash.c‎

Lines changed: 8 additions & 52 deletions
Original file line numberDiff line numberDiff line change
@@ -8,7 +8,7 @@
88
*
99
*
1010
* IDENTIFICATION
11-
* $PostgreSQL: pgsql/src/backend/access/hash/hash.c,v 1.105 2008/09/15 18:43:41 tgl Exp $
11+
* $PostgreSQL: pgsql/src/backend/access/hash/hash.c,v 1.106 2008/10/17 23:50:57 tgl Exp $
1212
*
1313
* NOTES
1414
* This file contains only the public interface routines.
@@ -345,10 +345,9 @@ hashbeginscan(PG_FUNCTION_ARGS)
345345
so= (HashScanOpaque)palloc(sizeof(HashScanOpaqueData));
346346
so->hashso_bucket_valid= false;
347347
so->hashso_bucket_blkno=0;
348-
so->hashso_curbuf=so->hashso_mrkbuf=InvalidBuffer;
349-
/* setpositions invalid (this will cause _hash_first call) */
348+
so->hashso_curbuf=InvalidBuffer;
349+
/* setposition invalid (this will cause _hash_first call) */
350350
ItemPointerSetInvalid(&(so->hashso_curpos));
351-
ItemPointerSetInvalid(&(so->hashso_mrkpos));
352351

353352
scan->opaque=so;
354353

@@ -372,23 +371,18 @@ hashrescan(PG_FUNCTION_ARGS)
372371
/* if we are called from beginscan, so is still NULL */
373372
if (so)
374373
{
375-
/* release anypins we still hold */
374+
/* release anypin we still hold */
376375
if (BufferIsValid(so->hashso_curbuf))
377376
_hash_dropbuf(rel,so->hashso_curbuf);
378377
so->hashso_curbuf=InvalidBuffer;
379378

380-
if (BufferIsValid(so->hashso_mrkbuf))
381-
_hash_dropbuf(rel,so->hashso_mrkbuf);
382-
so->hashso_mrkbuf=InvalidBuffer;
383-
384379
/* release lock on bucket, too */
385380
if (so->hashso_bucket_blkno)
386381
_hash_droplock(rel,so->hashso_bucket_blkno,HASH_SHARE);
387382
so->hashso_bucket_blkno=0;
388383

389-
/* setpositions invalid (this will cause _hash_first call) */
384+
/* setposition invalid (this will cause _hash_first call) */
390385
ItemPointerSetInvalid(&(so->hashso_curpos));
391-
ItemPointerSetInvalid(&(so->hashso_mrkpos));
392386
}
393387

394388
/* Update scan key, if a new one is given */
@@ -417,15 +411,11 @@ hashendscan(PG_FUNCTION_ARGS)
417411
/* don't need scan registered anymore */
418412
_hash_dropscan(scan);
419413

420-
/* release anypins we still hold */
414+
/* release anypin we still hold */
421415
if (BufferIsValid(so->hashso_curbuf))
422416
_hash_dropbuf(rel,so->hashso_curbuf);
423417
so->hashso_curbuf=InvalidBuffer;
424418

425-
if (BufferIsValid(so->hashso_mrkbuf))
426-
_hash_dropbuf(rel,so->hashso_mrkbuf);
427-
so->hashso_mrkbuf=InvalidBuffer;
428-
429419
/* release lock on bucket, too */
430420
if (so->hashso_bucket_blkno)
431421
_hash_droplock(rel,so->hashso_bucket_blkno,HASH_SHARE);
@@ -443,24 +433,7 @@ hashendscan(PG_FUNCTION_ARGS)
443433
Datum
444434
hashmarkpos(PG_FUNCTION_ARGS)
445435
{
446-
IndexScanDescscan= (IndexScanDesc)PG_GETARG_POINTER(0);
447-
HashScanOpaqueso= (HashScanOpaque)scan->opaque;
448-
Relationrel=scan->indexRelation;
449-
450-
/* release pin on old marked data, if any */
451-
if (BufferIsValid(so->hashso_mrkbuf))
452-
_hash_dropbuf(rel,so->hashso_mrkbuf);
453-
so->hashso_mrkbuf=InvalidBuffer;
454-
ItemPointerSetInvalid(&(so->hashso_mrkpos));
455-
456-
/* bump pin count on current buffer and copy to marked buffer */
457-
if (ItemPointerIsValid(&(so->hashso_curpos)))
458-
{
459-
IncrBufferRefCount(so->hashso_curbuf);
460-
so->hashso_mrkbuf=so->hashso_curbuf;
461-
so->hashso_mrkpos=so->hashso_curpos;
462-
}
463-
436+
elog(ERROR,"hash does not support mark/restore");
464437
PG_RETURN_VOID();
465438
}
466439

@@ -470,24 +443,7 @@ hashmarkpos(PG_FUNCTION_ARGS)
470443
Datum
471444
hashrestrpos(PG_FUNCTION_ARGS)
472445
{
473-
IndexScanDescscan= (IndexScanDesc)PG_GETARG_POINTER(0);
474-
HashScanOpaqueso= (HashScanOpaque)scan->opaque;
475-
Relationrel=scan->indexRelation;
476-
477-
/* release pin on current data, if any */
478-
if (BufferIsValid(so->hashso_curbuf))
479-
_hash_dropbuf(rel,so->hashso_curbuf);
480-
so->hashso_curbuf=InvalidBuffer;
481-
ItemPointerSetInvalid(&(so->hashso_curpos));
482-
483-
/* bump pin count on marked buffer and copy to current buffer */
484-
if (ItemPointerIsValid(&(so->hashso_mrkpos)))
485-
{
486-
IncrBufferRefCount(so->hashso_mrkbuf);
487-
so->hashso_curbuf=so->hashso_mrkbuf;
488-
so->hashso_curpos=so->hashso_mrkpos;
489-
}
490-
446+
elog(ERROR,"hash does not support mark/restore");
491447
PG_RETURN_VOID();
492448
}
493449

‎src/include/access/hash.h‎

Lines changed: 4 additions & 6 deletions
Original file line numberDiff line numberDiff line change
@@ -7,7 +7,7 @@
77
* Portions Copyright (c) 1996-2008, PostgreSQL Global Development Group
88
* Portions Copyright (c) 1994, Regents of the University of California
99
*
10-
* $PostgreSQL: pgsql/src/include/access/hash.h,v 1.90 2008/09/15 18:43:41 tgl Exp $
10+
* $PostgreSQL: pgsql/src/include/access/hash.h,v 1.91 2008/10/17 23:50:57 tgl Exp $
1111
*
1212
* NOTES
1313
*modeled after Margo Seltzer's hash implementation for unix.
@@ -92,17 +92,15 @@ typedef struct HashScanOpaqueData
9292
BlockNumberhashso_bucket_blkno;
9393

9494
/*
95-
* We also want to remember whichbuffers we're currently examining in the
96-
* scan. We keepthese buffers pinned (but not locked) across hashgettuple
95+
* We also want to remember whichbuffer we're currently examining in the
96+
* scan. We keepthe buffer pinned (but not locked) across hashgettuple
9797
* calls, in order to avoid doing a ReadBuffer() for every tuple in the
9898
* index.
9999
*/
100100
Bufferhashso_curbuf;
101-
Bufferhashso_mrkbuf;
102101

103-
/* Currentand markedposition of the scan */
102+
/* Current position of the scan */
104103
ItemPointerDatahashso_curpos;
105-
ItemPointerDatahashso_mrkpos;
106104
}HashScanOpaqueData;
107105

108106
typedefHashScanOpaqueData*HashScanOpaque;

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