code: private Collection<HColumn<String, byte[]>> createColumnSet(Object obj) {
      Map<String, HColumn<String, byte[]>> map = createColumnMap(obj);
      if (null != map) {
        return map.values();
      } else {
        return null;
      }
    }
docs: Create Set of HColumns for the given Object. The Object must be annotated
  with {@link Column} on the desired fields.
  
  @param obj
  @return