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Commitb9856b6

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Fix GiST's killing tuple: GISTScanOpaque->curpos wasn't
correctly set. As result, killtuple() marks as deadwrong tuple on page. Bug was introduced by me while fixingpossible duplicates during GiST index scan.
1 parent361bfc3 commitb9856b6

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2 files changed

+30
-21
lines changed

2 files changed

+30
-21
lines changed

‎src/backend/access/gist/gistget.c

Lines changed: 27 additions & 19 deletions
Original file line numberDiff line numberDiff line change
@@ -8,7 +8,7 @@
88
* Portions Copyright (c) 1994, Regents of the University of California
99
*
1010
* IDENTIFICATION
11-
* $PostgreSQL: pgsql/src/backend/access/gist/gistget.c,v 1.78 2008/10/20 16:35:14 teodor Exp $
11+
* $PostgreSQL: pgsql/src/backend/access/gist/gistget.c,v 1.79 2008/10/22 12:53:56 teodor Exp $
1212
*
1313
*-------------------------------------------------------------------------
1414
*/
@@ -51,7 +51,7 @@ killtuple(Relation r, GISTScanOpaque so, ItemPointer iptr)
5151

5252
for (offset=FirstOffsetNumber;offset <=maxoff;offset=OffsetNumberNext(offset))
5353
{
54-
IndexTupleituple= (IndexTuple)PageGetItem(p,PageGetItemId(p,offset));
54+
IndexTupleituple= (IndexTuple)PageGetItem(p,PageGetItemId(p,offset));
5555

5656
if (ItemPointerEquals(&(ituple->t_tid),iptr))
5757
{
@@ -139,24 +139,28 @@ gistnext(IndexScanDesc scan, TIDBitmap *tbm)
139139
if (so->qual_ok== false )
140140
return0;
141141

142-
if (ItemPointerIsValid(&so->curpos)==false)
142+
if (so->curbuf==InvalidBuffer )
143143
{
144-
/* Being asked to fetch the first entry, so start at the root */
145-
Assert(so->curbuf==InvalidBuffer);
146-
Assert(so->stack==NULL);
144+
if (ItemPointerIsValid(&so->curpos)== false)
145+
{
146+
/* Being asked to fetch the first entry, so start at the root */
147+
Assert(so->curbuf==InvalidBuffer);
148+
Assert(so->stack==NULL);
147149

148-
so->curbuf=ReadBuffer(scan->indexRelation,GIST_ROOT_BLKNO);
150+
so->curbuf=ReadBuffer(scan->indexRelation,GIST_ROOT_BLKNO);
149151

150-
stk=so->stack= (GISTSearchStack*)palloc0(sizeof(GISTSearchStack));
152+
stk=so->stack= (GISTSearchStack*)palloc0(sizeof(GISTSearchStack));
151153

152-
stk->next=NULL;
153-
stk->block=GIST_ROOT_BLKNO;
154+
stk->next=NULL;
155+
stk->block=GIST_ROOT_BLKNO;
154156

155-
pgstat_count_index_scan(scan->indexRelation);
156-
}
157-
elseif (so->curbuf==InvalidBuffer)
158-
{
159-
return0;
157+
pgstat_count_index_scan(scan->indexRelation);
158+
}
159+
else
160+
{
161+
/* scan is finished */
162+
return0;
163+
}
160164
}
161165

162166
/*
@@ -171,8 +175,13 @@ gistnext(IndexScanDesc scan, TIDBitmap *tbm)
171175

172176
if (so->curPageData<so->nPageData )
173177
{
174-
scan->xs_ctup.t_self=so->pageData[so->curPageData ].iptr;
178+
scan->xs_ctup.t_self=so->pageData[so->curPageData ].heapPtr;
175179
scan->xs_recheck=so->pageData[so->curPageData ].recheck;
180+
181+
ItemPointerSet(&so->curpos,
182+
BufferGetBlockNumber(so->curbuf),
183+
so->pageData[so->curPageData ].pageOffset);
184+
176185
so->curPageData++;
177186

178187
return1;
@@ -307,8 +316,6 @@ gistnext(IndexScanDesc scan, TIDBitmap *tbm)
307316
* return success. Note that we keep "curbuf" pinned so that
308317
* we can efficiently resume the index scan later.
309318
*/
310-
ItemPointerSet(&(so->curpos),
311-
BufferGetBlockNumber(so->curbuf),n);
312319

313320
if (!(scan->ignore_killed_tuples&&
314321
ItemIdIsDead(PageGetItemId(p,n))))
@@ -319,7 +326,8 @@ gistnext(IndexScanDesc scan, TIDBitmap *tbm)
319326
tbm_add_tuples(tbm,&it->t_tid,1,scan->xs_recheck);
320327
else
321328
{
322-
so->pageData[so->nPageData ].iptr=it->t_tid;
329+
so->pageData[so->nPageData ].heapPtr=it->t_tid;
330+
so->pageData[so->nPageData ].pageOffset=n;
323331
so->pageData[so->nPageData ].recheck=scan->xs_recheck;
324332
so->nPageData++;
325333
}

‎src/include/access/gist_private.h

Lines changed: 3 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -7,7 +7,7 @@
77
* Portions Copyright (c) 1996-2008, PostgreSQL Global Development Group
88
* Portions Copyright (c) 1994, Regents of the University of California
99
*
10-
* $PostgreSQL: pgsql/src/include/access/gist_private.h,v 1.34 2008/10/20 13:39:44 teodor Exp $
10+
* $PostgreSQL: pgsql/src/include/access/gist_private.h,v 1.35 2008/10/22 12:53:56 teodor Exp $
1111
*
1212
*-------------------------------------------------------------------------
1313
*/
@@ -60,7 +60,8 @@ typedef struct GISTSTATE
6060

6161
typedefstructItemResult
6262
{
63-
ItemPointerDataiptr;
63+
ItemPointerDataheapPtr;
64+
OffsetNumberpageOffset;/* offset in index page */
6465
boolrecheck;
6566
}ItemResult;
6667

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