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First steps towards index scans with heap access decoupled from index

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access: define new index access method functions 'amgetmulti' that can
fetch multiple TIDs per call.  (The functions exist but are totally
untested as yet.)  Since I was modifying pg_am anyway, remove the
no-longer-needed 'rel' parameter from amcostestimate functions, and
also remove the vestigial amowner column that was creating useless
work for Alvaro's shared-object-dependencies project.
Initdb forced due to changes in pg_am.
This commit is contained in:
Tom Lane
2005-03-27 23:53:05 +00:00
parent 351519affc
commit bf3dbb5881
20 changed files with 535 additions and 174 deletions
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46
src/backend/access/rtree/rtget.c
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@@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/access/rtree/rtget.c,v 1.34 2005/01/18 23:25:43 neilc Exp $
* $PostgreSQL: pgsql/src/backend/access/rtree/rtget.c,v 1.35 2005/03/27 23:53:02 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -29,15 +29,13 @@ rtgettuple(PG_FUNCTION_ARGS)
{
IndexScanDesc s = (IndexScanDesc) PG_GETARG_POINTER(0);
ScanDirection dir = (ScanDirection) PG_GETARG_INT32(1);
RTreeScanOpaque so = (RTreeScanOpaque) s->opaque;
Page page;
OffsetNumber offnum;
RTreeScanOpaque so;
so = (RTreeScanOpaque) s->opaque;
/*
* If we've already produced a tuple and the executor has informed
* us that it should be marked "killed", do so know.
* us that it should be marked "killed", do so now.
*/
if (s->kill_prior_tuple && ItemPointerIsValid(&(s->currentItemData)))
{
@@ -57,7 +55,7 @@ rtgettuple(PG_FUNCTION_ARGS)
{
bool res = rtnext(s, dir);
if (res == true && s->ignore_killed_tuples)
if (res && s->ignore_killed_tuples)
{
offnum = ItemPointerGetOffsetNumber(&(s->currentItemData));
page = BufferGetPage(so->curbuf);
@@ -69,6 +67,42 @@ rtgettuple(PG_FUNCTION_ARGS)
}
}
Datum
rtgetmulti(PG_FUNCTION_ARGS)
{
IndexScanDesc s = (IndexScanDesc) PG_GETARG_POINTER(0);
ItemPointer tids = (ItemPointer) PG_GETARG_POINTER(1);
int32 max_tids = PG_GETARG_INT32(2);
int32 *returned_tids = (int32 *) PG_GETARG_POINTER(3);
RTreeScanOpaque so = (RTreeScanOpaque) s->opaque;
bool res = true;
int32 ntids = 0;
/* XXX generic implementation: loop around guts of rtgettuple */
while (ntids < max_tids)
{
res = rtnext(s, ForwardScanDirection);
if (res && s->ignore_killed_tuples)
{
Page page;
OffsetNumber offnum;
offnum = ItemPointerGetOffsetNumber(&(s->currentItemData));
page = BufferGetPage(so->curbuf);
if (ItemIdDeleted(PageGetItemId(page, offnum)))
continue;
}
if (!res)
break;
tids[ntids] = s->xs_ctup.t_self;
ntids++;
}
*returned_tids = ntids;
PG_RETURN_BOOL(res);
}
static bool
rtnext(IndexScanDesc s, ScanDirection dir)
{