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Commitbe09bc9

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Modify nodeAgg.c so that no rows are returned for a GROUP BY
with no input rows, per pghackers discussions around 7/22/99. Clean upa bunch of ugly coding while at it; remove redundant re-lookup ofaggregate info at start of each new GROUP. Arrange to pfree intermediatevalues when they are pass-by-ref types, so that aggregates on pass-by-reftypes no longer eat memory. This takes care of a couple of TODO items...
1 parent40f6524 commitbe09bc9

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4 files changed

+452
-416
lines changed

4 files changed

+452
-416
lines changed

‎src/backend/executor/execQual.c‎

Lines changed: 6 additions & 8 deletions
Original file line numberDiff line numberDiff line change
@@ -7,7 +7,7 @@
77
*
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*
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* IDENTIFICATION
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* $Header: /cvsroot/pgsql/src/backend/executor/execQual.c,v 1.61 1999/09/2602:28:15 tgl Exp $
10+
* $Header: /cvsroot/pgsql/src/backend/executor/execQual.c,v 1.62 1999/09/2621:21:09 tgl Exp $
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*
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*-------------------------------------------------------------------------
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*/
@@ -209,8 +209,8 @@ ExecEvalArrayRef(ArrayRef *arrayRef,
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staticDatum
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ExecEvalAggref(Aggref*aggref,ExprContext*econtext,bool*isNull)
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{
212-
*isNull=econtext->ecxt_nulls[aggref->aggno];
213-
returnecontext->ecxt_values[aggref->aggno];
212+
*isNull=econtext->ecxt_aggnulls[aggref->aggno];
213+
returnecontext->ecxt_aggvalues[aggref->aggno];
214214
}
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/* ----------------------------------------------------------------
@@ -244,7 +244,6 @@ ExecEvalVar(Var *variable, ExprContext *econtext, bool *isNull)
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AttrNumberattnum;
245245
HeapTupleheapTuple;
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TupleDesctuple_type;
247-
Bufferbuffer;
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boolbyval;
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int16len;
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@@ -272,22 +271,21 @@ ExecEvalVar(Var *variable, ExprContext *econtext, bool *isNull)
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*/
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heapTuple=slot->val;
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tuple_type=slot->ttc_tupleDescriptor;
275-
buffer=slot->ttc_buffer;
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277275
attnum=variable->varattno;
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279277
/* (See prolog for explanation of this Assert) */
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Assert(attnum <=0||
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(attnum-1 <=tuple_type->natts-1&&
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tuple_type->attrs[attnum-1]!=NULL&&
283-
variable->vartype==tuple_type->attrs[attnum-1]->atttypid))
281+
variable->vartype==tuple_type->attrs[attnum-1]->atttypid));
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/*
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* If the attribute number is invalid, then we are supposed to return
287285
* the entire tuple, we give back a whole slot so that callers know
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* what the tuple looks like.
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*/
290-
if (attnum==InvalidAttrNumber)
288+
if (attnum==InvalidAttrNumber)
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{
292290
TupleTableSlot*tempSlot;
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TupleDesctd;
@@ -301,7 +299,7 @@ ExecEvalVar(Var *variable, ExprContext *econtext, bool *isNull)
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tempSlot->ttc_whichplan=-1;
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303301
tup=heap_copytuple(heapTuple);
304-
td=CreateTupleDescCopy(slot->ttc_tupleDescriptor);
302+
td=CreateTupleDescCopy(tuple_type);
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ExecSetSlotDescriptor(tempSlot,td);
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