return new GroupedStream(s, _groupFields);
}
@Override
public IAggregatableStream partitionAggregate(Fields inputFields, Aggregator agg, Fields functionFields) {
Aggregator groupedAgg = new GroupedAggregator(agg, _groupFields, inputFields, functionFields.size());
Fields allInFields = TridentUtils.fieldsUnion(_groupFields, inputFields);
Fields allOutFields = TridentUtils.fieldsConcat(_groupFields, functionFields);
Stream s = _stream.partitionAggregate(allInFields, groupedAgg, allOutFields);
return new GroupedStream(s, _groupFields);
}