POProject prj = new POProject(new OperatorKey("", r.nextLong()), -1, 0);
POMapLookUp op = new POMapLookUp(new OperatorKey("", r.nextLong()), -1);
PhysicalPlan plan = new PhysicalPlan();
plan.add(op);
plan.add(prj);
plan.connect(prj, op);
for(int i = 0 ; i < 10; i++) {
map = GenRandomData.genRandMap(r, 10);
Tuple t = TupleFactory.getInstance().newTuple();
t.append(map);