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Redefine the lp_flags field of item pointers as having four states, rather

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than two independent bits (one of which was never used in heap pages anyway,
or at least hadn't been in a very long time).  This gives us flexibility to
add the HOT notions of redirected and dead item pointers without requiring
anything so klugy as magic values of lp_off and lp_len.  The state values
are chosen so that for the states currently in use (pre-HOT) there is no
change in the physical representation.
This commit is contained in:
Tom Lane
2007-09-12 22:10:26 +00:00
parent eb0a7735ba
commit 6889303531
31 changed files with 278 additions and 185 deletions
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8
src/backend/access/gist/gistget.c
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@ -8,7 +8,7 @@
* Portions Copyright (c) 1994, Regents of the University of California
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/access/gist/gistget.c,v 1.66 2007/05/27 03:50:38 tgl Exp $
* $PostgreSQL: pgsql/src/backend/access/gist/gistget.c,v 1.67 2007/09/12 22:10:25 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -46,7 +46,7 @@ killtuple(Relation r, GISTScanOpaque so, ItemPointer iptr)
{
/* page unchanged, so all is simple */
offset = ItemPointerGetOffsetNumber(iptr);
PageGetItemId(p, offset)->lp_flags |= LP_DELETE;
ItemIdMarkDead(PageGetItemId(p, offset));
SetBufferCommitInfoNeedsSave(buffer);
LockBuffer(buffer, GIST_UNLOCK);
break;
@ -61,7 +61,7 @@ killtuple(Relation r, GISTScanOpaque so, ItemPointer iptr)
if (ItemPointerEquals(&(ituple->t_tid), iptr))
{
/* found */
PageGetItemId(p, offset)->lp_flags |= LP_DELETE;
ItemIdMarkDead(PageGetItemId(p, offset));
SetBufferCommitInfoNeedsSave(buffer);
LockBuffer(buffer, GIST_UNLOCK);
if (buffer != so->curbuf)
@ -289,7 +289,7 @@ gistnext(IndexScanDesc scan, ScanDirection dir, ItemPointer tids,
ItemPointerSet(&(so->curpos),
BufferGetBlockNumber(so->curbuf), n);
if (!(ignore_killed_tuples && ItemIdDeleted(PageGetItemId(p, n))))
if (!(ignore_killed_tuples && ItemIdIsDead(PageGetItemId(p, n))))
{
it = (IndexTuple) PageGetItem(p, PageGetItemId(p, n));
tids[ntids] = scan->xs_ctup.t_self = it->t_tid;