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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 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
parent
40f6524161
commit
be09bc9ff2
@ -7,7 +7,7 @@
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*
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*
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* IDENTIFICATION
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* $Header: /cvsroot/pgsql/src/backend/executor/execQual.c,v 1.61 1999/09/26 02:28:15 tgl Exp $
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* $Header: /cvsroot/pgsql/src/backend/executor/execQual.c,v 1.62 1999/09/26 21:21:09 tgl Exp $
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*
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*-------------------------------------------------------------------------
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*/
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@ -209,8 +209,8 @@ ExecEvalArrayRef(ArrayRef *arrayRef,
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static Datum
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ExecEvalAggref(Aggref *aggref, ExprContext *econtext, bool *isNull)
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{
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*isNull = econtext->ecxt_nulls[aggref->aggno];
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return econtext->ecxt_values[aggref->aggno];
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*isNull = econtext->ecxt_aggnulls[aggref->aggno];
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return econtext->ecxt_aggvalues[aggref->aggno];
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}
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/* ----------------------------------------------------------------
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@ -244,7 +244,6 @@ ExecEvalVar(Var *variable, ExprContext *econtext, bool *isNull)
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AttrNumber attnum;
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HeapTuple heapTuple;
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TupleDesc tuple_type;
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Buffer buffer;
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bool byval;
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int16 len;
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@ -272,7 +271,6 @@ 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;
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buffer = slot->ttc_buffer;
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attnum = variable->varattno;
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@ -280,14 +278,14 @@ ExecEvalVar(Var *variable, ExprContext *econtext, bool *isNull)
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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 &&
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variable->vartype == tuple_type->attrs[attnum - 1]->atttypid))
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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
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* 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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*/
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if (attnum == InvalidAttrNumber)
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if (attnum == InvalidAttrNumber)
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{
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TupleTableSlot *tempSlot;
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TupleDesc td;
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@ -301,7 +299,7 @@ ExecEvalVar(Var *variable, ExprContext *econtext, bool *isNull)
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tempSlot->ttc_whichplan = -1;
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tup = heap_copytuple(heapTuple);
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td = CreateTupleDescCopy(slot->ttc_tupleDescriptor);
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td = CreateTupleDescCopy(tuple_type);
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ExecSetSlotDescriptor(tempSlot, td);
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File diff suppressed because it is too large
Load Diff
@ -7,7 +7,7 @@
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*
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*
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* IDENTIFICATION
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* $Header: /cvsroot/pgsql/src/backend/utils/adt/float.c,v 1.48 1999/09/21 20:58:25 momjian Exp $
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* $Header: /cvsroot/pgsql/src/backend/utils/adt/float.c,v 1.49 1999/09/26 21:21:15 tgl Exp $
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*
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*-------------------------------------------------------------------------
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*/
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@ -540,22 +540,25 @@ float4div(float32 arg1, float32 arg2)
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CheckFloat4Val(val);
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result = (float32) palloc(sizeof(float32data));
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*result = *arg1 / *arg2;
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*result = val;
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return result;
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}
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float32
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float4inc(float32 arg1)
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{
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float32 result;
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double val;
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if (!arg1)
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return (float32) NULL;
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val = *arg1 + (float32data) 1.0;
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CheckFloat4Val(val);
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*arg1 = val;
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return arg1;
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result = (float32) palloc(sizeof(float32data));
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*result = val;
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return result;
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}
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/*
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@ -639,6 +642,7 @@ float8div(float64 arg1, float64 arg2)
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float64
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float8inc(float64 arg1)
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{
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float64 result;
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double val;
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if (!arg1)
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@ -646,8 +650,9 @@ float8inc(float64 arg1)
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val = *arg1 + (float64data) 1.0;
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CheckFloat8Val(val);
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*arg1 = val;
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return arg1;
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result = (float64) palloc(sizeof(float64data));
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*result = val;
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return result;
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}
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@ -1388,7 +1393,7 @@ float48eq(float32 arg1, float64 arg2)
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if (!arg1 || !arg2)
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return 0;
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return *arg1 == (float) *arg2;
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return *arg1 == *arg2;
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}
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bool
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@ -1397,7 +1402,7 @@ float48ne(float32 arg1, float64 arg2)
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if (!arg1 || !arg2)
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return 0;
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return *arg1 != (float) *arg2;
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return *arg1 != *arg2;
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}
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bool
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@ -1406,7 +1411,7 @@ float48lt(float32 arg1, float64 arg2)
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if (!arg1 || !arg2)
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return 0;
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return *arg1 < (float) *arg2;
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return *arg1 < *arg2;
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}
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bool
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@ -1415,7 +1420,7 @@ float48le(float32 arg1, float64 arg2)
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if (!arg1 || !arg2)
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return 0;
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return *arg1 <= (float) *arg2;
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return *arg1 <= *arg2;
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}
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bool
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@ -1424,7 +1429,7 @@ float48gt(float32 arg1, float64 arg2)
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if (!arg1 || !arg2)
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return 0;
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return *arg1 > (float) *arg2;
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return *arg1 > *arg2;
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}
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bool
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@ -1433,7 +1438,7 @@ float48ge(float32 arg1, float64 arg2)
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if (!arg1 || !arg2)
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return 0;
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return *arg1 >= (float) *arg2;
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return *arg1 >= *arg2;
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}
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/*
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@ -1445,7 +1450,7 @@ float84eq(float64 arg1, float32 arg2)
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if (!arg1 || !arg2)
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return 0;
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return (float) *arg1 == *arg2;
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return *arg1 == *arg2;
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}
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bool
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@ -1454,7 +1459,7 @@ float84ne(float64 arg1, float32 arg2)
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if (!arg1 || !arg2)
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return 0;
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return (float) *arg1 != *arg2;
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return *arg1 != *arg2;
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}
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bool
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@ -1463,7 +1468,7 @@ float84lt(float64 arg1, float32 arg2)
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if (!arg1 || !arg2)
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return 0;
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return (float) *arg1 < *arg2;
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return *arg1 < *arg2;
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}
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bool
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@ -1472,7 +1477,7 @@ float84le(float64 arg1, float32 arg2)
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if (!arg1 || !arg2)
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return 0;
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return (float) *arg1 <= *arg2;
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return *arg1 <= *arg2;
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}
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bool
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@ -1481,7 +1486,7 @@ float84gt(float64 arg1, float32 arg2)
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if (!arg1 || !arg2)
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return 0;
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return (float) *arg1 > *arg2;
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return *arg1 > *arg2;
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}
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bool
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@ -1490,7 +1495,7 @@ float84ge(float64 arg1, float32 arg2)
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if (!arg1 || !arg2)
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return 0;
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return (float) *arg1 >= *arg2;
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return *arg1 >= *arg2;
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}
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/* ========== PRIVATE ROUTINES ========== */
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@ -6,7 +6,7 @@
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*
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* Copyright (c) 1994, Regents of the University of California
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*
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* $Id: execnodes.h,v 1.35 1999/09/24 00:25:22 tgl Exp $
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* $Id: execnodes.h,v 1.36 1999/09/26 21:21:04 tgl Exp $
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*
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*-------------------------------------------------------------------------
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*/
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@ -88,8 +88,8 @@ typedef struct ExprContext
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ParamListInfo ecxt_param_list_info;
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ParamExecData *ecxt_param_exec_vals; /* this is for subselects */
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List *ecxt_range_table;
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Datum *ecxt_values; /* precomputed values for aggreg */
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char *ecxt_nulls; /* null flags for aggreg values */
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Datum *ecxt_aggvalues; /* precomputed values for Aggref nodes */
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bool *ecxt_aggnulls; /* null flags for Aggref nodes */
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} ExprContext;
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/* ----------------
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@ -565,14 +565,20 @@ typedef struct MaterialState
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/* ---------------------
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* AggregateState information
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*
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* done indicated whether aggregate has been materialized
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* Note: the associated ExprContext contains ecxt_aggvalues and ecxt_aggnulls
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* arrays, which hold the computed agg values for the current input group
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* during evaluation of an Agg node's output tuple(s).
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* -------------------------
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*/
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typedef struct AggStatePerAggData *AggStatePerAgg; /* private in nodeAgg.c */
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typedef struct AggState
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{
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CommonScanState csstate; /* its first field is NodeTag */
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List *aggs; /* all Aggref nodes in targetlist & quals */
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bool agg_done;
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int numaggs; /* length of list (could be zero!) */
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AggStatePerAgg peragg; /* per-Aggref working state */
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bool agg_done; /* indicates completion of Agg scan */
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} AggState;
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/* ---------------------
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