docs: @Override
  	public CommerceDiscount fetchByG_C_Last(long groupId, String couponCode,
  		OrderByComparator<CommerceDiscount> orderByComparator) {
  		int count = countByG_C(groupId, couponCode);
  
  		if (count == 0) {
  			return null;
  		}
  
  		List<CommerceDiscount> list = findByG_C(groupId, couponCode, count - 1,
  				count, orderByComparator);
  
  		if (!list.isEmpty()) {
  			return list.get(0);
  		}
  
  		return null;
  	}