protected override IStream <AggregationResult <TIn, TMultiKey, TAggrRes> > CreateOutputStream(AggregateMultiKeyArgs <TIn, TAggrRes, TMultiKey> args)
{
var keyProcessor = GroupProcessor.Create(args.GetKeys);
var observableOut = args.InputStream.Observable.Do(keyProcessor.ProcessRow).Last().MultiMap <TIn, AggregationResult <TIn, TMultiKey, TAggrRes> >((i, pushValue) =>
{
foreach (var group in keyProcessor.GetGroups())
{
TIn first = default;
TAggrRes aggrRes = default;
foreach (var item in group.Value)
{
if (first != null)
{
first = item;
aggrRes = args.CreateEmptyAggregation(first);
}
aggrRes = args.Aggregate(aggrRes, item);
}
pushValue(new AggregationResult <TIn, TMultiKey, TAggrRes>
{
Aggregation = aggrRes,
FirstValue = first,
Key = group.Key
});
}
});
return(CreateUnsortedStream(observableOut));
}
public AggregateMultiKeyStreamNode(string name, AggregateMultiKeyArgs <TIn, TAggrRes, TMultiKey> args) : base(name, args)
{
}
