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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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10
src/backend/access/hash/hash.c
View File

@@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/access/hash/hash.c,v 1.95 2007/05/30 20:11:51 tgl Exp $
* $PostgreSQL: pgsql/src/backend/access/hash/hash.c,v 1.96 2007/09/12 22:10:25 tgl Exp $
*
* NOTES
* This file contains only the public interface routines.
@@ -193,11 +193,11 @@ hashgettuple(PG_FUNCTION_ARGS)
if (scan->kill_prior_tuple)
{
/*
* Yes, so mark it by setting the LP_DELETE bit in the item flags.
* Yes, so mark it by setting the LP_DEAD state in the item flags.
*/
offnum = ItemPointerGetOffsetNumber(&(so->hashso_curpos));
page = BufferGetPage(so->hashso_curbuf);
PageGetItemId(page, offnum)->lp_flags |= LP_DELETE;
ItemIdMarkDead(PageGetItemId(page, offnum));
/*
* Since this can be redone later if needed, it's treated the same
@@ -224,7 +224,7 @@ hashgettuple(PG_FUNCTION_ARGS)
{
offnum = ItemPointerGetOffsetNumber(&(so->hashso_curpos));
page = BufferGetPage(so->hashso_curbuf);
if (!ItemIdDeleted(PageGetItemId(page, offnum)))
if (!ItemIdIsDead(PageGetItemId(page, offnum)))
break;
res = _hash_next(scan, dir);
}
@@ -286,7 +286,7 @@ hashgetmulti(PG_FUNCTION_ARGS)
offnum = ItemPointerGetOffsetNumber(&(so->hashso_curpos));
page = BufferGetPage(so->hashso_curbuf);
if (!ItemIdDeleted(PageGetItemId(page, offnum)))
if (!ItemIdIsDead(PageGetItemId(page, offnum)))
break;
res = _hash_next(scan, ForwardScanDirection);
}

4
src/backend/access/hash/hashinsert.c
View File

@@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/access/hash/hashinsert.c,v 1.45 2007/05/03 16:45:58 tgl Exp $
* $PostgreSQL: pgsql/src/backend/access/hash/hashinsert.c,v 1.46 2007/09/12 22:10:25 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -200,7 +200,7 @@ _hash_pgaddtup(Relation rel,
page = BufferGetPage(buf);
itup_off = OffsetNumberNext(PageGetMaxOffsetNumber(page));
if (PageAddItem(page, (Item) itup, itemsize, itup_off, LP_USED)
if (PageAddItem(page, (Item) itup, itemsize, itup_off, false)
== InvalidOffsetNumber)
elog(ERROR, "failed to add index item to \"%s\"",
RelationGetRelationName(rel));

4
src/backend/access/hash/hashovfl.c
View File

@@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/access/hash/hashovfl.c,v 1.58 2007/05/30 20:11:51 tgl Exp $
* $PostgreSQL: pgsql/src/backend/access/hash/hashovfl.c,v 1.59 2007/09/12 22:10:25 tgl Exp $
*
* NOTES
* Overflow pages look like ordinary relation pages.
@@ -684,7 +684,7 @@ _hash_squeezebucket(Relation rel,
* we have found room so insert on the "write" page.
*/
woffnum = OffsetNumberNext(PageGetMaxOffsetNumber(wpage));
if (PageAddItem(wpage, (Item) itup, itemsz, woffnum, LP_USED)
if (PageAddItem(wpage, (Item) itup, itemsz, woffnum, false)
== InvalidOffsetNumber)
elog(ERROR, "failed to add index item to \"%s\"",
RelationGetRelationName(rel));

4
src/backend/access/hash/hashpage.c
View File

@@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/access/hash/hashpage.c,v 1.68 2007/05/30 20:11:51 tgl Exp $
* $PostgreSQL: pgsql/src/backend/access/hash/hashpage.c,v 1.69 2007/09/12 22:10:25 tgl Exp $
*
* NOTES
* Postgres hash pages look like ordinary relation pages. The opaque
@@ -830,7 +830,7 @@ _hash_splitbucket(Relation rel,
}
noffnum = OffsetNumberNext(PageGetMaxOffsetNumber(npage));
if (PageAddItem(npage, (Item) itup, itemsz, noffnum, LP_USED)
if (PageAddItem(npage, (Item) itup, itemsz, noffnum, false)
== InvalidOffsetNumber)
elog(ERROR, "failed to add index item to \"%s\"",
RelationGetRelationName(rel));