rf = requiredOutputInfo.requiredFieldsList.get(i);
} catch (Exception e) {
}
if (rf!=null)
{
rf.reIndex(0);
requiredFields.merge(rf);
} else {
// need all fields
List<Pair<Integer, Integer>> l = new ArrayList<Pair<Integer, Integer>>();
for (int j=0;j<rlo.getSchema().size();j++)