public IKGroupedTable <KR, VR> GroupBy <KR, VR, KRS, VRS>(IKeyValueMapper <K, V, KeyValuePair <KR, VR> > keySelector, string named = null)
where KRS : ISerDes <KR>, new()
where VRS : ISerDes <VR>, new()
=> DoGroup(keySelector, Grouped <KR, VR> .Create <KRS, VRS>(named));
public IKGroupedTable <KR, VR> GroupBy <KR, VR>(IKeyValueMapper <K, V, KeyValuePair <KR, VR> > keySelector, string named = null) => DoGroup(keySelector, Grouped <KR, VR> .Create(named, null, null));