database/postgres
1
0
Fork 0
mirror of https://github.com/postgres/postgres.git synced 2025-11-03 09:13:20 +03:00
Code Activity

Modify nodeAgg.c so that no rows are returned for a GROUP BY

Browse Source 
with no input rows, per pghackers discussions around 7/22/99.  Clean up
a bunch of ugly coding while at it; remove redundant re-lookup of
aggregate info at start of each new GROUP.  Arrange to pfree intermediate
values when they are pass-by-ref types, so that aggregates on pass-by-ref
types no longer eat memory.  This takes care of a couple of TODO items...
This commit is contained in:
Tom Lane
1999-09-26 21:21:15 +00:00
parent 40f6524161
commit be09bc9ff2
4 changed files with 450 additions and 414 deletions
Download Patch File Download Diff File Expand all files Collapse all files

14
src/backend/executor/execQual.c
View File

@@ -7,7 +7,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/executor/execQual.c,v 1.61 1999/09/26 02:28:15 tgl Exp $
* $Header: /cvsroot/pgsql/src/backend/executor/execQual.c,v 1.62 1999/09/26 21:21:09 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -209,8 +209,8 @@ ExecEvalArrayRef(ArrayRef *arrayRef,
static Datum
ExecEvalAggref(Aggref *aggref, ExprContext *econtext, bool *isNull)
{
*isNull = econtext->ecxt_nulls[aggref->aggno];
return econtext->ecxt_values[aggref->aggno];
*isNull = econtext->ecxt_aggnulls[aggref->aggno];
return econtext->ecxt_aggvalues[aggref->aggno];
}
/* ----------------------------------------------------------------
@@ -244,7 +244,6 @@ ExecEvalVar(Var *variable, ExprContext *econtext, bool *isNull)
AttrNumber attnum;
HeapTuple heapTuple;
TupleDesc tuple_type;
Buffer buffer;
bool byval;
int16 len;
@@ -272,7 +271,6 @@ ExecEvalVar(Var *variable, ExprContext *econtext, bool *isNull)
*/
heapTuple = slot->val;
tuple_type = slot->ttc_tupleDescriptor;
buffer = slot->ttc_buffer;
attnum = variable->varattno;
@@ -280,14 +278,14 @@ ExecEvalVar(Var *variable, ExprContext *econtext, bool *isNull)
Assert(attnum <= 0 ||
(attnum - 1 <= tuple_type->natts - 1 &&
tuple_type->attrs[attnum - 1] != NULL &&
variable->vartype == tuple_type->attrs[attnum - 1]->atttypid))
variable->vartype == tuple_type->attrs[attnum - 1]->atttypid));
/*
* If the attribute number is invalid, then we are supposed to return
* the entire tuple, we give back a whole slot so that callers know
* what the tuple looks like.
*/
if (attnum == InvalidAttrNumber)
if (attnum == InvalidAttrNumber)
{
TupleTableSlot *tempSlot;
TupleDesc td;
@@ -301,7 +299,7 @@ ExecEvalVar(Var *variable, ExprContext *econtext, bool *isNull)
tempSlot->ttc_whichplan = -1;
tup = heap_copytuple(heapTuple);
td = CreateTupleDescCopy(slot->ttc_tupleDescriptor);
td = CreateTupleDescCopy(tuple_type);
ExecSetSlotDescriptor(tempSlot, td);