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Catch non-functional delete attempts.

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This commit is contained in:
Vadim B. Mikheev
1997-08-06 02:08:39 +00:00
parent 6ed1715b1f
commit b3d8beaa1a
1 changed files with 14 additions and 1 deletions
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15
src/backend/access/heap/heapam.c
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@@ -7,7 +7,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/access/heap/heapam.c,v 1.11 1997/03/28 07:04:11 scrappy Exp $
* $Header: /cvsroot/pgsql/src/backend/access/heap/heapam.c,v 1.12 1997/08/06 02:08:39 vadim Exp $
*
*
* INTERFACE ROUTINES
@@ -1150,6 +1150,19 @@ heap_delete(Relation relation, ItemPointer tid)
dp = (PageHeader) BufferGetPage(b);
lp = PageGetItemId(dp, ItemPointerGetOffsetNumber(tid));
/*
* Just like test against non-functional updates we try to catch
* non-functional delete attempts. - vadim 05/05/97
*/
tp = (HeapTuple) PageGetItem((Page)dp, lp);
Assert(HeapTupleIsValid(tp));
if (TupleUpdatedByCurXactAndCmd(tp)) {
elog(NOTICE, "Non-functional delete, tuple already deleted");
if ( IsSystemRelationName(RelationGetRelationName(relation)->data) )
RelationUnsetLockForWrite(relation);
ReleaseBuffer(b);
return;
}
/* ----------------
* check that we're deleteing a valid item
* ----------------