public TridentTuple create(List<Object> selfVals) {
   return new TridentTupleView(PersistentVector.EMPTY.cons(selfVals), _index, _fieldIndex);
 }
 public TridentTuple create(Tuple parent) {
   return new TridentTupleView(
       PersistentVector.EMPTY.cons(parent.getValues()), index, fieldIndex);
 }