database/postgres
1
0
Fork 0
mirror of https://github.com/postgres/postgres.git synced 2025-06-16 06:01:02 +03:00
Code Activity

Restructure indexscan API (index_beginscan, index_getnext) per

Browse Source 
yesterday's proposal to pghackers.  Also remove unnecessary parameters
to heap_beginscan, heap_rescan.  I modified pg_proc.h to reflect the
new numbers of parameters for the AM interface routines, but did not
force an initdb because nothing actually looks at those fields.
This commit is contained in:
Tom Lane
2002-05-20 23:51:44 +00:00
parent c961474c96
commit 44fbe20d62
59 changed files with 834 additions and 1283 deletions
Download Patch File Download Diff File Expand all files Collapse all files

112
src/backend/access/gist/gistget.c
View File

@ -8,7 +8,7 @@
* Portions Copyright (c) 1994, Regents of the University of California
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/access/gist/gistget.c,v 1.32 2002/03/05 05:30:31 momjian Exp $
* $Header: /cvsroot/pgsql/src/backend/access/gist/gistget.c,v 1.33 2002/05/20 23:51:41 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -20,10 +20,9 @@
static OffsetNumber gistfindnext(IndexScanDesc s, Page p, OffsetNumber n,
ScanDirection dir);
static RetrieveIndexResult gistscancache(IndexScanDesc s, ScanDirection dir);
static RetrieveIndexResult gistfirst(IndexScanDesc s, ScanDirection dir);
static RetrieveIndexResult gistnext(IndexScanDesc s, ScanDirection dir);
static ItemPointer gistheapptr(Relation r, ItemPointer itemp);
static bool gistscancache(IndexScanDesc s, ScanDirection dir);
static bool gistfirst(IndexScanDesc s, ScanDirection dir);
static bool gistnext(IndexScanDesc s, ScanDirection dir);
static bool gistindex_keytest(IndexTuple tuple,
int scanKeySize, ScanKey key, GISTSTATE *giststate,
Relation r, Page p, OffsetNumber offset);
@ -34,35 +33,34 @@ gistgettuple(PG_FUNCTION_ARGS)
{
IndexScanDesc s = (IndexScanDesc) PG_GETARG_POINTER(0);
ScanDirection dir = (ScanDirection) PG_GETARG_INT32(1);
RetrieveIndexResult res;
bool res;
/* if we have it cached in the scan desc, just return the value */
if ((res = gistscancache(s, dir)) != (RetrieveIndexResult) NULL)
PG_RETURN_POINTER(res);
if (gistscancache(s, dir))
PG_RETURN_BOOL(true);
/* not cached, so we'll have to do some work */
if (ItemPointerIsValid(&(s->currentItemData)))
res = gistnext(s, dir);
else
res = gistfirst(s, dir);
PG_RETURN_POINTER(res);
PG_RETURN_BOOL(res);
}
static RetrieveIndexResult
static bool
gistfirst(IndexScanDesc s, ScanDirection dir)
{
Buffer b;
Page p;
OffsetNumber n;
OffsetNumber maxoff;
RetrieveIndexResult res;
GISTPageOpaque po;
GISTScanOpaque so;
GISTSTACK *stk;
BlockNumber blk;
IndexTuple it;
b = ReadBuffer(s->relation, GISTP_ROOT);
b = ReadBuffer(s->indexRelation, GISTP_ROOT);
p = BufferGetPage(b);
po = (GISTPageOpaque) PageGetSpecialPointer(p);
so = (GISTScanOpaque) s->opaque;
@ -77,13 +75,12 @@ gistfirst(IndexScanDesc s, ScanDirection dir)
while (n < FirstOffsetNumber || n > maxoff)
{
ReleaseBuffer(b);
if (so->s_stack == (GISTSTACK *) NULL)
return (RetrieveIndexResult) NULL;
return false;
stk = so->s_stack;
b = ReadBuffer(s->relation, stk->gs_blk);
b = ReadBuffer(s->indexRelation, stk->gs_blk);
p = BufferGetPage(b);
po = (GISTPageOpaque) PageGetSpecialPointer(p);
maxoff = PageGetMaxOffsetNumber(p);
@ -103,10 +100,10 @@ gistfirst(IndexScanDesc s, ScanDirection dir)
it = (IndexTuple) PageGetItem(p, PageGetItemId(p, n));
res = FormRetrieveIndexResult(&(s->currentItemData), &(it->t_tid));
s->xs_ctup.t_self = it->t_tid;
ReleaseBuffer(b);
return res;
return true;
}
else
{
@ -120,21 +117,20 @@ gistfirst(IndexScanDesc s, ScanDirection dir)
blk = ItemPointerGetBlockNumber(&(it->t_tid));
ReleaseBuffer(b);
b = ReadBuffer(s->relation, blk);
b = ReadBuffer(s->indexRelation, blk);
p = BufferGetPage(b);
po = (GISTPageOpaque) PageGetSpecialPointer(p);
}
}
}
static RetrieveIndexResult
static bool
gistnext(IndexScanDesc s, ScanDirection dir)
{
Buffer b;
Page p;
OffsetNumber n;
OffsetNumber maxoff;
RetrieveIndexResult res;
GISTPageOpaque po;
GISTScanOpaque so;
GISTSTACK *stk;
@ -149,7 +145,7 @@ gistnext(IndexScanDesc s, ScanDirection dir)
else
n = OffsetNumberPrev(n);
b = ReadBuffer(s->relation, blk);
b = ReadBuffer(s->indexRelation, blk);
p = BufferGetPage(b);
po = (GISTPageOpaque) PageGetSpecialPointer(p);
so = (GISTScanOpaque) s->opaque;
@ -161,13 +157,12 @@ gistnext(IndexScanDesc s, ScanDirection dir)
while (n < FirstOffsetNumber || n > maxoff)
{
ReleaseBuffer(b);
if (so->s_stack == (GISTSTACK *) NULL)
return (RetrieveIndexResult) NULL;
return false;
stk = so->s_stack;
b = ReadBuffer(s->relation, stk->gs_blk);
b = ReadBuffer(s->indexRelation, stk->gs_blk);
p = BufferGetPage(b);
maxoff = PageGetMaxOffsetNumber(p);
po = (GISTPageOpaque) PageGetSpecialPointer(p);
@ -187,10 +182,10 @@ gistnext(IndexScanDesc s, ScanDirection dir)
it = (IndexTuple) PageGetItem(p, PageGetItemId(p, n));
res = FormRetrieveIndexResult(&(s->currentItemData), &(it->t_tid));
s->xs_ctup.t_self = it->t_tid;
ReleaseBuffer(b);
return res;
return true;
}
else
{
@ -204,7 +199,7 @@ gistnext(IndexScanDesc s, ScanDirection dir)
blk = ItemPointerGetBlockNumber(&(it->t_tid));
ReleaseBuffer(b);
b = ReadBuffer(s->relation, blk);
b = ReadBuffer(s->indexRelation, blk);
p = BufferGetPage(b);
po = (GISTPageOpaque) PageGetSpecialPointer(p);
@ -233,7 +228,6 @@ gistindex_keytest(IndexTuple tuple,
IncrIndexProcessed();
while (scanKeySize > 0)
{
datum = index_getattr(tuple,
@ -314,7 +308,7 @@ gistfindnext(IndexScanDesc s, Page p, OffsetNumber n, ScanDirection dir)
it = (IndexTuple) PageGetItem(p, PageGetItemId(p, n));
if (gistindex_keytest(it,
s->numberOfKeys, s->keyData, giststate,
s->relation, p, n))
s->indexRelation, p, n))
break;
if (ScanDirectionIsBackward(dir))
@ -326,57 +320,25 @@ gistfindnext(IndexScanDesc s, Page p, OffsetNumber n, ScanDirection dir)
return n;
}
static RetrieveIndexResult
static bool
gistscancache(IndexScanDesc s, ScanDirection dir)
{
RetrieveIndexResult res;
ItemPointer ip;
if (!(ScanDirectionIsNoMovement(dir)
&& ItemPointerIsValid(&(s->currentItemData))))
{
return (RetrieveIndexResult) NULL;
}
ip = gistheapptr(s->relation, &(s->currentItemData));
if (ItemPointerIsValid(ip))
res = FormRetrieveIndexResult(&(s->currentItemData), ip);
else
res = (RetrieveIndexResult) NULL;
pfree(ip);
return res;
}
/*
* gistheapptr returns the item pointer to the tuple in the heap relation
* for which itemp is the index relation item pointer.
*/
static ItemPointer
gistheapptr(Relation r, ItemPointer itemp)
{
Buffer b;
Page p;
IndexTuple it;
ItemPointer ip;
OffsetNumber n;
IndexTuple it;
ip = (ItemPointer) palloc(sizeof(ItemPointerData));
if (ItemPointerIsValid(itemp))
{
b = ReadBuffer(r, ItemPointerGetBlockNumber(itemp));
p = BufferGetPage(b);
n = ItemPointerGetOffsetNumber(itemp);
it = (IndexTuple) PageGetItem(p, PageGetItemId(p, n));
memmove((char *) ip, (char *) &(it->t_tid),
sizeof(ItemPointerData));
ReleaseBuffer(b);
}
else
ItemPointerSetInvalid(ip);
if (!(ScanDirectionIsNoMovement(dir)
&& ItemPointerIsValid(&(s->currentItemData))))
return false;
return ip;
b = ReadBuffer(s->indexRelation,
ItemPointerGetBlockNumber(&(s->currentItemData)));
p = BufferGetPage(b);
n = ItemPointerGetOffsetNumber(&(s->currentItemData));
it = (IndexTuple) PageGetItem(p, PageGetItemId(p, n));
s->xs_ctup.t_self = it->t_tid;
ReleaseBuffer(b);
return true;
}