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Push the responsibility for handling ignore_killed_tuples down into

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_bt_checkkeys(), instead of checking it in the top-level nbtree.c routines
as formerly.  This saves a little bit of loop overhead, but more importantly
it lets us skip performing the index key comparisons for dead tuples.
This commit is contained in:
Tom Lane
2005-12-07 19:37:53 +00:00
parent f1b059af12
commit cefcbbf1fd
4 changed files with 72 additions and 72 deletions
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41
src/backend/access/nbtree/nbtree.c
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@ -12,7 +12,7 @@
* Portions Copyright (c) 1994, Regents of the University of California
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/access/nbtree/nbtree.c,v 1.134 2005/11/22 18:17:06 momjian Exp $
* $PostgreSQL: pgsql/src/backend/access/nbtree/nbtree.c,v 1.135 2005/12/07 19:37:53 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -288,21 +288,6 @@ btgettuple(PG_FUNCTION_ARGS)
else
res = _bt_first(scan, dir);
/*
* Skip killed tuples if asked to.
*/
if (scan->ignore_killed_tuples)
{
while (res)
{
offnum = ItemPointerGetOffsetNumber(&(scan->currentItemData));
page = BufferGetPage(so->btso_curbuf);
if (!ItemIdDeleted(PageGetItemId(page, offnum)))
break;
res = _bt_next(scan, dir);
}
}
/*
* Save heap TID to use it in _bt_restscan. Then release the read lock on
* the buffer so that we aren't blocking other backends.
@ -353,25 +338,6 @@ btgetmulti(PG_FUNCTION_ARGS)
res = _bt_next(scan, ForwardScanDirection);
else
res = _bt_first(scan, ForwardScanDirection);
/*
* Skip killed tuples if asked to.
*/
if (scan->ignore_killed_tuples)
{
while (res)
{
Page page;
OffsetNumber offnum;
offnum = ItemPointerGetOffsetNumber(&(scan->currentItemData));
page = BufferGetPage(so->btso_curbuf);
if (!ItemIdDeleted(PageGetItemId(page, offnum)))
break;
res = _bt_next(scan, ForwardScanDirection);
}
}
if (!res)
break;
/* Save tuple ID, and continue scanning */
@ -385,9 +351,8 @@ btgetmulti(PG_FUNCTION_ARGS)
*/
if (res)
{
((BTScanOpaque) scan->opaque)->curHeapIptr = scan->xs_ctup.t_self;
LockBuffer(((BTScanOpaque) scan->opaque)->btso_curbuf,
BUFFER_LOCK_UNLOCK);
so->curHeapIptr = scan->xs_ctup.t_self;
LockBuffer(so->btso_curbuf, BUFFER_LOCK_UNLOCK);
}
*returned_tids = ntids;