@Override
public void stepFinal(VLongWritable vertexIndex, DoubleWritable partialAggregate)
throws HyracksDataException {
sum += partialAggregate.get();
}
@Override
public void setPartialCombineState(DoubleWritable combineState) {
sum = combineState.get();
}
@Override
public void stepPartial(VLongWritable vertexIndex, DoubleWritable msg)
throws HyracksDataException {
sum += msg.get();
}
