* Portions Copyright (c) 1994, Regents of the University of California
*
* IDENTIFICATION
- * $PostgreSQL: pgsql/src/backend/access/gist/gistget.c,v 1.63 2007/01/05 22:19:22 momjian Exp $
+ * $PostgreSQL: pgsql/src/backend/access/gist/gistget.c,v 1.64 2007/01/20 18:43:35 neilc Exp $
*
*-------------------------------------------------------------------------
*/
* If we have produced an index tuple in the past and the executor has
* informed us we need to mark it as "killed", do so now.
*/
- if (scan->kill_prior_tuple && ItemPointerIsValid(&(scan->currentItemData)))
- killtuple(scan->indexRelation, so, &(scan->currentItemData));
+ if (scan->kill_prior_tuple && ItemPointerIsValid(&(so->curpos)))
+ killtuple(scan->indexRelation, so, &(so->curpos));
/*
* Get the next tuple that matches the search key. If asked to skip killed
* tuples. Returns true iff a matching tuple was found.
*/
static int
-gistnext(IndexScanDesc scan, ScanDirection dir, ItemPointer tids, int maxtids, bool ignore_killed_tuples)
+gistnext(IndexScanDesc scan, ScanDirection dir, ItemPointer tids,
+ int maxtids, bool ignore_killed_tuples)
{
Page p;
OffsetNumber n;
so = (GISTScanOpaque) scan->opaque;
- if (ItemPointerIsValid(&scan->currentItemData) == false)
+ if (ItemPointerIsValid(&so->curpos) == false)
{
/* Being asked to fetch the first entry, so start at the root */
Assert(so->curbuf == InvalidBuffer);
}
if (!GistPageIsLeaf(p) || resetoffset ||
- !ItemPointerIsValid(&scan->currentItemData))
+ !ItemPointerIsValid(&so->curpos))
{
if (ScanDirectionIsBackward(dir))
n = PageGetMaxOffsetNumber(p);
}
else
{
- n = ItemPointerGetOffsetNumber(&(scan->currentItemData));
+ n = ItemPointerGetOffsetNumber(&(so->curpos));
if (ScanDirectionIsBackward(dir))
n = OffsetNumberPrev(n);
* we can efficiently resume the index scan later.
*/
- ItemPointerSet(&(scan->currentItemData),
+ ItemPointerSet(&(so->curpos),
BufferGetBlockNumber(so->curbuf), n);
if (!(ignore_killed_tuples && ItemIdDeleted(PageGetItemId(p, n))))
* Portions Copyright (c) 1994, Regents of the University of California
*
* IDENTIFICATION
- * $PostgreSQL: pgsql/src/backend/access/gist/gistscan.c,v 1.66 2007/01/05 22:19:22 momjian Exp $
+ * $PostgreSQL: pgsql/src/backend/access/gist/gistscan.c,v 1.67 2007/01/20 18:43:35 neilc Exp $
*
*-------------------------------------------------------------------------
*/
GISTScanOpaque so;
int i;
- /*
- * Clear all the pointers.
- */
- ItemPointerSetInvalid(&scan->currentItemData);
- ItemPointerSetInvalid(&scan->currentMarkData);
-
so = (GISTScanOpaque) scan->opaque;
if (so != NULL)
{
scan->opaque = so;
}
+ /*
+ * Clear all the pointers.
+ */
+ ItemPointerSetInvalid(&so->curpos);
+ ItemPointerSetInvalid(&so->markpos);
+
/* Update scan key, if a new one is given */
if (key && scan->numberOfKeys > 0)
{
*n,
*tmp;
- scan->currentMarkData = scan->currentItemData;
so = (GISTScanOpaque) scan->opaque;
+ so->markpos = so->curpos;
if (so->flags & GS_CURBEFORE)
so->flags |= GS_MRKBEFORE;
else
*n,
*tmp;
- scan->currentItemData = scan->currentMarkData;
so = (GISTScanOpaque) scan->opaque;
+ so->curpos = so->markpos;
if (so->flags & GS_MRKBEFORE)
so->flags |= GS_CURBEFORE;
else
*
*
* IDENTIFICATION
- * $PostgreSQL: pgsql/src/backend/access/hash/hash.c,v 1.92 2007/01/05 22:19:22 momjian Exp $
+ * $PostgreSQL: pgsql/src/backend/access/hash/hash.c,v 1.93 2007/01/20 18:43:35 neilc Exp $
*
* NOTES
* This file contains only the public interface routines.
* appropriate direction. If we haven't done so yet, we call a routine to
* get the first item in the scan.
*/
- if (ItemPointerIsValid(&(scan->currentItemData)))
+ if (ItemPointerIsValid(&(so->hashso_curpos)))
{
/*
* Check to see if we should kill the previously-fetched tuple.
/*
* Yes, so mark it by setting the LP_DELETE bit in the item flags.
*/
- offnum = ItemPointerGetOffsetNumber(&(scan->currentItemData));
+ offnum = ItemPointerGetOffsetNumber(&(so->hashso_curpos));
page = BufferGetPage(so->hashso_curbuf);
PageGetItemId(page, offnum)->lp_flags |= LP_DELETE;
{
while (res)
{
- offnum = ItemPointerGetOffsetNumber(&(scan->currentItemData));
+ offnum = ItemPointerGetOffsetNumber(&(so->hashso_curpos));
page = BufferGetPage(so->hashso_curbuf);
if (!ItemIdDeleted(PageGetItemId(page, offnum)))
break;
/*
* Start scan, or advance to next tuple.
*/
- if (ItemPointerIsValid(&(scan->currentItemData)))
+ if (ItemPointerIsValid(&(so->hashso_curpos)))
res = _hash_next(scan, ForwardScanDirection);
else
res = _hash_first(scan, ForwardScanDirection);
Page page;
OffsetNumber offnum;
- offnum = ItemPointerGetOffsetNumber(&(scan->currentItemData));
+ offnum = ItemPointerGetOffsetNumber(&(so->hashso_curpos));
page = BufferGetPage(so->hashso_curbuf);
if (!ItemIdDeleted(PageGetItemId(page, offnum)))
break;
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) */
+ ItemPointerSetInvalid(&(so->hashso_curpos));
+ ItemPointerSetInvalid(&(so->hashso_mrkpos));
+
scan->opaque = so;
/* register scan in case we change pages it's using */
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) */
- ItemPointerSetInvalid(&(scan->currentItemData));
- ItemPointerSetInvalid(&(scan->currentMarkData));
+ /* set positions invalid (this will cause _hash_first call) */
+ ItemPointerSetInvalid(&(so->hashso_curpos));
+ ItemPointerSetInvalid(&(so->hashso_mrkpos));
+ }
/* Update scan key, if a new one is given */
if (scankey && scan->numberOfKeys > 0)
_hash_droplock(rel, so->hashso_bucket_blkno, HASH_SHARE);
so->hashso_bucket_blkno = 0;
- /* be tidy */
- ItemPointerSetInvalid(&(scan->currentItemData));
- ItemPointerSetInvalid(&(scan->currentMarkData));
-
pfree(so);
scan->opaque = NULL;
if (BufferIsValid(so->hashso_mrkbuf))
_hash_dropbuf(rel, so->hashso_mrkbuf);
so->hashso_mrkbuf = InvalidBuffer;
- ItemPointerSetInvalid(&(scan->currentMarkData));
+ ItemPointerSetInvalid(&(so->hashso_mrkpos));
- /* bump pin count on currentItemData and copy to currentMarkData */
- if (ItemPointerIsValid(&(scan->currentItemData)))
+ /* 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;
- scan->currentMarkData = scan->currentItemData;
+ so->hashso_mrkpos = so->hashso_curpos;
}
PG_RETURN_VOID();
if (BufferIsValid(so->hashso_curbuf))
_hash_dropbuf(rel, so->hashso_curbuf);
so->hashso_curbuf = InvalidBuffer;
- ItemPointerSetInvalid(&(scan->currentItemData));
+ ItemPointerSetInvalid(&(so->hashso_curpos));
- /* bump pin count on currentMarkData and copy to currentItemData */
- if (ItemPointerIsValid(&(scan->currentMarkData)))
+ /* 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;
- scan->currentItemData = scan->currentMarkData;
+ so->hashso_curpos = so->hashso_mrkpos;
}
PG_RETURN_VOID();
*
*
* IDENTIFICATION
- * $PostgreSQL: pgsql/src/backend/access/hash/hashsearch.c,v 1.46 2007/01/05 22:19:22 momjian Exp $
+ * $PostgreSQL: pgsql/src/backend/access/hash/hashsearch.c,v 1.47 2007/01/20 18:43:35 neilc Exp $
*
*-------------------------------------------------------------------------
*/
/*
* _hash_next() -- Get the next item in a scan.
*
- * On entry, we have a valid currentItemData in the scan, and a
+ * On entry, we have a valid hashso_curpos in the scan, and a
* pin and read lock on the page that contains that item.
* We find the next item in the scan, if any.
* On success exit, we have the page containing the next item
return false;
/* if we're here, _hash_step found a valid tuple */
- current = &(scan->currentItemData);
+ current = &(so->hashso_curpos);
offnum = ItemPointerGetOffsetNumber(current);
_hash_checkpage(rel, buf, LH_BUCKET_PAGE | LH_OVERFLOW_PAGE);
page = BufferGetPage(buf);
pgstat_count_index_scan(&scan->xs_pgstat_info);
- current = &(scan->currentItemData);
+ current = &(so->hashso_curpos);
ItemPointerSetInvalid(current);
/*
* _hash_step() -- step to the next valid item in a scan in the bucket.
*
* If no valid record exists in the requested direction, return
- * false. Else, return true and set the CurrentItemData for the
+ * false. Else, return true and set the hashso_curpos for the
* scan to the right thing.
*
* 'bufP' points to the current buffer, which is pinned and read-locked.
BlockNumber blkno;
IndexTuple itup;
- current = &(scan->currentItemData);
+ current = &(so->hashso_curpos);
buf = *bufP;
_hash_checkpage(rel, buf, LH_BUCKET_PAGE | LH_OVERFLOW_PAGE);
*
*
* IDENTIFICATION
- * $PostgreSQL: pgsql/src/backend/access/index/genam.c,v 1.60 2007/01/05 22:19:22 momjian Exp $
+ * $PostgreSQL: pgsql/src/backend/access/index/genam.c,v 1.61 2007/01/20 18:43:35 neilc Exp $
*
* NOTES
* many of the old access method routines have been turned into
scan->opaque = NULL;
- ItemPointerSetInvalid(&scan->currentItemData);
- ItemPointerSetInvalid(&scan->currentMarkData);
-
ItemPointerSetInvalid(&scan->xs_ctup.t_self);
scan->xs_ctup.t_data = NULL;
scan->xs_cbuf = InvalidBuffer;
* Portions Copyright (c) 1996-2007, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
- * $PostgreSQL: pgsql/src/include/access/gist_private.h,v 1.25 2007/01/05 22:19:51 momjian Exp $
+ * $PostgreSQL: pgsql/src/include/access/gist_private.h,v 1.26 2007/01/20 18:43:35 neilc Exp $
*
*-------------------------------------------------------------------------
*/
GISTSTATE *giststate;
MemoryContext tempCxt;
Buffer curbuf;
+ ItemPointerData curpos;
Buffer markbuf;
+ ItemPointerData markpos;
} GISTScanOpaqueData;
typedef GISTScanOpaqueData *GISTScanOpaque;
* Portions Copyright (c) 1996-2007, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
- * $PostgreSQL: pgsql/src/include/access/hash.h,v 1.74 2007/01/05 22:19:51 momjian Exp $
+ * $PostgreSQL: pgsql/src/include/access/hash.h,v 1.75 2007/01/20 18:43:35 neilc Exp $
*
* NOTES
* modeled after Margo Seltzer's hash implementation for unix.
*/
Buffer hashso_curbuf;
Buffer hashso_mrkbuf;
+
+ /* Current and marked position of the scan */
+ ItemPointerData hashso_curpos;
+ ItemPointerData hashso_mrkpos;
} HashScanOpaqueData;
typedef HashScanOpaqueData *HashScanOpaque;
* Portions Copyright (c) 1996-2007, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
- * $PostgreSQL: pgsql/src/include/access/nbtree.h,v 1.108 2007/01/09 02:14:15 tgl Exp $
+ * $PostgreSQL: pgsql/src/include/access/nbtree.h,v 1.109 2007/01/20 18:43:35 neilc Exp $
*
*-------------------------------------------------------------------------
*/
* items were killed, we re-lock the page to mark them killed, then unlock.
* Finally we drop the pin and step to the next page in the appropriate
* direction.
- *
- * NOTE: in this implementation, btree does not use or set the
- * currentItemData and currentMarkData fields of IndexScanDesc at all.
*/
typedef struct BTScanPosItem /* what we remember about each match */
* Portions Copyright (c) 1996-2007, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
- * $PostgreSQL: pgsql/src/include/access/relscan.h,v 1.51 2007/01/05 22:19:51 momjian Exp $
+ * $PostgreSQL: pgsql/src/include/access/relscan.h,v 1.52 2007/01/20 18:43:35 neilc Exp $
*
*-------------------------------------------------------------------------
*/
/* index access method's private state */
void *opaque; /* access-method-specific info */
- /* these fields are used by some but not all AMs: */
- ItemPointerData currentItemData; /* current index pointer */
- ItemPointerData currentMarkData; /* marked position, if any */
/*
* xs_ctup/xs_cbuf are valid after a successful index_getnext. After
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