protected override IStream <TOut> CreateOutputStream(ReKeyArgs <TIn, TOut, TMultiKey> args)
{
var keyProcessor = GroupProcessor.Create(args.GetKeys);
var observableOut = args.InputStream.Observable.Do(keyProcessor.ProcessRow).Last().MultiMap <TIn, TOut>((i, pushValue) =>
{
var groups = keyProcessor.GetGroups();
foreach (var elt in groups.SelectMany(g => g.Value.Select(v => new { Row = v, g.Key })))
{
pushValue(args.ResultSelector(elt.Row, elt.Key));
}
});
return(CreateUnsortedStream(observableOut));
}