为什么doctrine可以通过虚拟连接列进行排序并具有setMaxResult和setFirstResult？

Question

我有以下问题： 我想从实体中选择一些字段，并为每个选定的行计算一些来自另一个表的行。

我运行以下代码：

    $qb = $this->createQueryBuilder('ff')
               ->select('ff as feedbackForm, COUNT(ffa.id) as completedForms')
               ->leftJoin('AppBundle:FeedbackFormAction', 'ffa', 'WITH','ffa.feedbackForm = ff.id ')
               ->groupBy('ff');

    if (!empty($pageSize)) {
        $qb->setMaxResults($pageSize);
    }

    if (!empty($offset)) {
        $qb->setFirstResult($offset);
    }

    if (!empty($orderBy)) {
        if ($orderBy != 'completedForms') {
            $orderBy   = "ff." . $orderBy;
        }
        $qb->orderBy($orderBy, $direction);
    }
    return $qb->getQuery()->getArrayResult();
}

主要的问题是，当我想通过completedForms订购并且$ pageSize和$ offset是SET时，doctrine无法处理代码，它说：

  

消息：执行＆＃39; SELECT * FROM时发生异常（SELECT ROW_NUMBER（）OVER（ORDER BY sclr_12 DESC）AS doctrine_rownum，m0_.id AS id_0，m0_.start_date AS start_date_1，m0_.end_date AS end_date_2， m0_.active AS active_3，m0_.completed_required AS completed_required_4，m0_.section AS section_5，m0_.form_question AS form_question_6，m0_.count_completed AS count_completed_7，m0_.count_canceled AS count_canceled_8，m0_.created_at AS created_at_9，m0_.updated_at AS updated_at_10，m0_。 deleted_at AS deleted_at_11，COUNT（m1_.id）AS sclr_12 FROM feedback_forms m0_ LEFT JOIN feedback_form_actions m1_ ON（m1_.feedback_form = m0_.id）WHERE m0_.deleted_at IS NULL GROUP BY m1_.id，m1_.created_at，m1_.feedback_form，m1_ .user_id）AS doctrine_tbl WHERE doctrine_rownum BETWEEN 2和6＆＃39; with params [2]：SQLSTATE [HY000]：常规错误：207常规SQL Server错误：检查来自SQL Server的消息[207]（严重级16）[（null）] [] []

但是当我只设置$ pageSize OR $ offset和ORDER BY completedForms列时，我得到了预期的结果。问题是当我设置两个变量（$ pageSize和$ offset）时。