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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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12
src/backend/access/nbtree/nbtxlog.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/nbtree/nbtxlog.c,v 1.44 2007/05/20 21:08:19 tgl Exp $
* $PostgreSQL: pgsql/src/backend/access/nbtree/nbtxlog.c,v 1.45 2007/09/12 22:10:26 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -142,7 +142,7 @@ _bt_restore_page(Page page, char *from, int len)
itemsz = IndexTupleDSize(itupdata);
itemsz = MAXALIGN(itemsz);
if (PageAddItem(page, (Item) from, itemsz,
FirstOffsetNumber, LP_USED) == InvalidOffsetNumber)
FirstOffsetNumber, false) == InvalidOffsetNumber)
elog(PANIC, "_bt_restore_page: cannot add item to page");
from += itemsz;
}
@ -238,7 +238,7 @@ btree_xlog_insert(bool isleaf, bool ismeta,
{
if (PageAddItem(page, (Item) datapos, datalen,
ItemPointerGetOffsetNumber(&(xlrec->target.tid)),
LP_USED) == InvalidOffsetNumber)
false) == InvalidOffsetNumber)
elog(PANIC, "btree_insert_redo: failed to add item");
PageSetLSN(page, lsn);
@ -389,7 +389,7 @@ btree_xlog_split(bool onleft, bool isroot,
if (onleft)
{
if (PageAddItem(lpage, newitem, newitemsz, newitemoff,
LP_USED) == InvalidOffsetNumber)
false) == InvalidOffsetNumber)
elog(PANIC, "failed to add new item to left page after split");
}
@ -398,7 +398,7 @@ btree_xlog_split(bool onleft, bool isroot,
hiItem = PageGetItem(rpage, hiItemId);
if (PageAddItem(lpage, hiItem, ItemIdGetLength(hiItemId),
P_HIKEY, LP_USED) == InvalidOffsetNumber)
P_HIKEY, false) == InvalidOffsetNumber)
elog(PANIC, "failed to add high key to left page after split");
/* Fix opaque fields */
@ -483,7 +483,7 @@ btree_xlog_delete(XLogRecPtr lsn, XLogRecord *record)
}
/*
* Mark the page as not containing any LP_DELETE items --- see comments in
* Mark the page as not containing any LP_DEAD items --- see comments in
* _bt_delitems().
*/
opaque = (BTPageOpaque) PageGetSpecialPointer(page);