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Make the world at least somewhat safe for zero-column tables, and

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remove the special case in ALTER DROP COLUMN to prohibit dropping a
table's last column.
This commit is contained in:
Tom Lane
2002-09-28 20:00:19 +00:00
parent 23616b47d5
commit 6d0d15c451
6 changed files with 64 additions and 81 deletions
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22
src/backend/executor/nodeAgg.c
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@ -46,7 +46,7 @@
* Portions Copyright (c) 1994, Regents of the University of California
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/executor/nodeAgg.c,v 1.87 2002/09/18 21:35:20 tgl Exp $
* $Header: /cvsroot/pgsql/src/backend/executor/nodeAgg.c,v 1.88 2002/09/28 20:00:19 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -658,20 +658,20 @@ ExecAgg(Agg *node)
if (inputTuple == NULL)
{
TupleDesc tupType;
Datum *tupValue;
char *null_array;
AttrNumber attnum;
Datum *dvalues;
char *dnulls;
tupType = aggstate->csstate.css_ScanTupleSlot->ttc_tupleDescriptor;
tupValue = projInfo->pi_tupValue;
/* watch out for null input tuples, though... */
if (tupType && tupValue)
if (tupType && tupType->natts > 0)
{
null_array = (char *) palloc(sizeof(char) * tupType->natts);
for (attnum = 0; attnum < tupType->natts; attnum++)
null_array[attnum] = 'n';
inputTuple = heap_formtuple(tupType, tupValue, null_array);
pfree(null_array);
dvalues = (Datum *) palloc(sizeof(Datum) * tupType->natts);
dnulls = (char *) palloc(sizeof(char) * tupType->natts);
MemSet(dvalues, 0, sizeof(Datum) * tupType->natts);
MemSet(dnulls, 'n', sizeof(char) * tupType->natts);
inputTuple = heap_formtuple(tupType, dvalues, dnulls);
pfree(dvalues);
pfree(dnulls);
}
}
}