PhysicalPlan expPlan = new PhysicalPlan();
expPlan.add(pr1);
sortPlans.add(expPlan);
List<Boolean> mAscCols = new LinkedList<Boolean>();
mAscCols.add(false);
PORead read = new PORead(new OperatorKey("", r.nextLong()), input);
List<PhysicalOperator> inputs = new LinkedList<PhysicalOperator>();
inputs.add(read);
POSort sort = new POSort(new OperatorKey("", r.nextLong()), -1, inputs,
sortPlans, mAscCols, null);
Tuple t = null;