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Correct some comments, fix a small memory wastage when datatype 

is pass-by-value.
This commit is contained in:
Tom Lane 1999-03-21 19:59:13 +00:00
parent beb1851dd9
commit 419b91c058
1 changed files with 15 additions and 12 deletions
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27
src/backend/executor/nodeAgg.c
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@ -67,10 +67,14 @@ static Datum aggGetAttr(TupleTableSlot *tuple, Aggref *aggref, bool *isNull);
* value1[i] = initcond1
* value2[i] = initcond2
* forall tuples do
* value1[i] = sfunc1(aggregate_attribute, value1[i])
* value1[i] = sfunc1(value1[i], aggregated_value)
* value2[i] = sfunc2(value2[i])
* value1[i] = finalfunc(value1[i], value2[i])
*
* If initcond1 is NULL then the first non-NULL aggregated_value is
* assigned directly to value1[i]. sfunc1 isn't applied until value1[i]
* is non-NULL.
*
* If the outer subplan is a Group node, ExecAgg returns as many tuples
* as there are groups.
*
@ -272,7 +276,6 @@ ExecAgg(Agg *node)
{
Aggref *aggref = lfirst(alist);
AttrNumber attnum;
int2 attlen = 0;
Datum newVal = (Datum) NULL;
AggFuncInfo *aggfns = &aggFuncInfo[++aggno];
Datum args[2];
@ -309,6 +312,7 @@ ExecAgg(Agg *node)
{
if (noInitValue[aggno])
{
int attlen = 0;
int byVal = 0;
/*
@ -352,16 +356,16 @@ ExecAgg(Agg *node)
default:
elog(ERROR, "ExecAgg: Bad Agg->Target for Agg %d", aggno);
}
if (attlen == -1)
{
/* variable length */
attlen = VARSIZE((struct varlena *) newVal);
}
value1[aggno] = (Datum) palloc(attlen);
if (byVal)
value1[aggno] = newVal;
else
memmove((char *) (value1[aggno]), (char *) newVal, attlen);
{
if (attlen == -1) /* variable length */
attlen = VARSIZE((struct varlena *) newVal);
value1[aggno] = (Datum) palloc(attlen);
memcpy((char *) (value1[aggno]), (char *) newVal,
attlen);
}
noInitValue[aggno] = 0;
nulls[aggno] = 0;
}
@ -380,10 +384,9 @@ ExecAgg(Agg *node)
if (aggfns->xfn2.fn_addr != NULL)
{
Datum xfn2_val = value2[aggno];
args[0] = value2[aggno];
value2[aggno] = (Datum) fmgr_c(&aggfns->xfn2,
(FmgrValues *) &xfn2_val, &isNull2);
(FmgrValues *) args, &isNull2);
Assert(!isNull2);
}
}