docs: List getGroupby()
      {
          List result = _getGroupby();
          Iterator iter = getCriteria().iterator();
          Object crit;
  
          while (iter.hasNext())
          {
              crit = iter.next();
              if (crit instanceof Criteria)
              {
                  result.addAll(((Criteria) crit).getGroupby());
              }
          }
  
          return result;
      }