10.4.1.2. 返回元组(tuples)的查询

（译注：元组(tuples)指一条结果行包含多个对象） Hibernate查询有时返回元组(tuples)，每个元组(tuples)以数组的形式返回:

Iterator kittensAndMothers = sess.createQuery(
            "select kitten, mother from Cat kitten join kitten.mother mother")
            .list()
            .iterator();
while ( kittensAndMothers.hasNext() ) {
    Object[] tuple = (Object[]) kittensAndMothers.next();
    Cat kitten  = tuple[0];
    Cat mother  = tuple[1];
    ....
}