@Test
public void testGroupSum() {

    final List<List<Object>> res = _personDao.findAll(SQL.select( Person.HEIGTH, Sql.sum( Person.ID)).from( Person.TABLE).where( Person.ID.gt(new PersonId(0L))).groupBy( Person.HEIGTH).orderBy( Person.HEIGTH));
    Assert.assertEquals(res, RESULT_SUM);
}