t = TupleFactory.getInstance().newTuple();
t.append(3);
t.append(6);
expected.add(t);
POCross poc = new POCross(new OperatorKey("", r.nextLong()), inputs);
DataBag obtained = BagFactory.getInstance().newDefaultBag();
for(Result res = poc.getNext(t); res.returnStatus != POStatus.STATUS_EOP; res = poc.getNext(t)) {
if(res.returnStatus == POStatus.STATUS_OK)
obtained.add((Tuple) res.result);
System.out.println(res.result);
}