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Remove useless mark/restore support in hash index AM, per discussion.

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(I'm leaving GiST/GIN cleanup to Teodor.)
This commit is contained in:
Tom Lane 2008-10-17 23:50:57 +00:00
parent 3e00496d88
commit af59a0650b
2 changed files with 12 additions and 58 deletions
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60
src/backend/access/hash/hash.c
View File

@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/access/hash/hash.c,v 1.105 2008/09/15 18:43:41 tgl Exp $
* $PostgreSQL: pgsql/src/backend/access/hash/hash.c,v 1.106 2008/10/17 23:50:57 tgl Exp $
*
* NOTES
* This file contains only the public interface routines.
@ -345,10 +345,9 @@ hashbeginscan(PG_FUNCTION_ARGS)
so = (HashScanOpaque) palloc(sizeof(HashScanOpaqueData));
so->hashso_bucket_valid = false;
so->hashso_bucket_blkno = 0;
so->hashso_curbuf = so->hashso_mrkbuf = InvalidBuffer;
/* set positions invalid (this will cause _hash_first call) */
so->hashso_curbuf = InvalidBuffer;
/* set position invalid (this will cause _hash_first call) */
ItemPointerSetInvalid(&(so->hashso_curpos));
ItemPointerSetInvalid(&(so->hashso_mrkpos));
scan->opaque = so;
@ -372,23 +371,18 @@ hashrescan(PG_FUNCTION_ARGS)
/* if we are called from beginscan, so is still NULL */
if (so)
{
/* release any pins we still hold */
/* release any pin we still hold */
if (BufferIsValid(so->hashso_curbuf))
_hash_dropbuf(rel, so->hashso_curbuf);
so->hashso_curbuf = InvalidBuffer;
if (BufferIsValid(so->hashso_mrkbuf))
_hash_dropbuf(rel, so->hashso_mrkbuf);
so->hashso_mrkbuf = InvalidBuffer;
/* release lock on bucket, too */
if (so->hashso_bucket_blkno)
_hash_droplock(rel, so->hashso_bucket_blkno, HASH_SHARE);
so->hashso_bucket_blkno = 0;
/* set positions invalid (this will cause _hash_first call) */
/* set position invalid (this will cause _hash_first call) */
ItemPointerSetInvalid(&(so->hashso_curpos));
ItemPointerSetInvalid(&(so->hashso_mrkpos));
}
/* Update scan key, if a new one is given */
@ -417,15 +411,11 @@ hashendscan(PG_FUNCTION_ARGS)
/* don't need scan registered anymore */
_hash_dropscan(scan);
/* release any pins we still hold */
/* release any pin we still hold */
if (BufferIsValid(so->hashso_curbuf))
_hash_dropbuf(rel, so->hashso_curbuf);
so->hashso_curbuf = InvalidBuffer;
if (BufferIsValid(so->hashso_mrkbuf))
_hash_dropbuf(rel, so->hashso_mrkbuf);
so->hashso_mrkbuf = InvalidBuffer;
/* release lock on bucket, too */
if (so->hashso_bucket_blkno)
_hash_droplock(rel, so->hashso_bucket_blkno, HASH_SHARE);
@ -443,24 +433,7 @@ hashendscan(PG_FUNCTION_ARGS)
Datum
hashmarkpos(PG_FUNCTION_ARGS)
{
IndexScanDesc scan = (IndexScanDesc) PG_GETARG_POINTER(0);
HashScanOpaque so = (HashScanOpaque) scan->opaque;
Relation rel = scan->indexRelation;
/* release pin on old marked data, if any */
if (BufferIsValid(so->hashso_mrkbuf))
_hash_dropbuf(rel, so->hashso_mrkbuf);
so->hashso_mrkbuf = InvalidBuffer;
ItemPointerSetInvalid(&(so->hashso_mrkpos));
/* bump pin count on current buffer and copy to marked buffer */
if (ItemPointerIsValid(&(so->hashso_curpos)))
{
IncrBufferRefCount(so->hashso_curbuf);
so->hashso_mrkbuf = so->hashso_curbuf;
so->hashso_mrkpos = so->hashso_curpos;
}
elog(ERROR, "hash does not support mark/restore");
PG_RETURN_VOID();
}
@ -470,24 +443,7 @@ hashmarkpos(PG_FUNCTION_ARGS)
Datum
hashrestrpos(PG_FUNCTION_ARGS)
{
IndexScanDesc scan = (IndexScanDesc) PG_GETARG_POINTER(0);
HashScanOpaque so = (HashScanOpaque) scan->opaque;
Relation rel = scan->indexRelation;
/* release pin on current data, if any */
if (BufferIsValid(so->hashso_curbuf))
_hash_dropbuf(rel, so->hashso_curbuf);
so->hashso_curbuf = InvalidBuffer;
ItemPointerSetInvalid(&(so->hashso_curpos));
/* bump pin count on marked buffer and copy to current buffer */
if (ItemPointerIsValid(&(so->hashso_mrkpos)))
{
IncrBufferRefCount(so->hashso_mrkbuf);
so->hashso_curbuf = so->hashso_mrkbuf;
so->hashso_curpos = so->hashso_mrkpos;
}
elog(ERROR, "hash does not support mark/restore");
PG_RETURN_VOID();
}

10
src/include/access/hash.h
View File

@ -7,7 +7,7 @@
* Portions Copyright (c) 1996-2008, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/include/access/hash.h,v 1.90 2008/09/15 18:43:41 tgl Exp $
* $PostgreSQL: pgsql/src/include/access/hash.h,v 1.91 2008/10/17 23:50:57 tgl Exp $
*
* NOTES
* modeled after Margo Seltzer's hash implementation for unix.
@ -92,17 +92,15 @@ typedef struct HashScanOpaqueData
BlockNumber hashso_bucket_blkno;
/*
* We also want to remember which buffers we're currently examining in the
* scan. We keep these buffers pinned (but not locked) across hashgettuple
* We also want to remember which buffer we're currently examining in the
* scan. We keep the buffer pinned (but not locked) across hashgettuple
* calls, in order to avoid doing a ReadBuffer() for every tuple in the
* index.
*/
Buffer hashso_curbuf;
Buffer hashso_mrkbuf;
/* Current and marked position of the scan */
/* Current position of the scan */
ItemPointerData hashso_curpos;
ItemPointerData hashso_mrkpos;
} HashScanOpaqueData;
typedef HashScanOpaqueData *HashScanOpaque;