Symfony2中SQL UNION查询的例子

我Symfony2的，我不知道如何加入2我的查询通过查询生成器在Symfony2中，我只可以加入SQL UNION查询。下面是返回正确的结果的查询。
SELECT * FROM (SELECT m.id, m.subject, m.date
FROM message m JOIN message_incoming mi ON m.id = mi.id
WHERE m.recipient_id = 1
AND mi.trash = 1
AND mi.deleted = 0) AS y
UNION
SELECT * FROM (SELECT m.id, m.subject, m.date
FROM message m JOIN message_outgoing mo ON m.id = mo.id
WHERE m.originator_id = 1
AND mo.trash = 1
AND mo.sent = 1
AND mo.deleted = 0) AS z
ORDER BY date DESC
我想加盟此代码，在短短1查询（不带），以得到正确的结果，但我失败了。 所以，我怎么能这个查询生成器？ 请指教，谢谢。
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1.最好的办法未做得多hacker对Doctrine2本身会写这样的查询NativeQuery。 本机/ SQLQueryBuilder使用的ORM的确切的API。而你能结果映射到现有实体。
2. 我不知道我有多么愚蠢是不检查的条件加入2查询时。 这是正确的查询：
SELECT m.id, m.subject, m.date
FROM message m
JOIN message_incoming mi ON m.id = mi.id
JOIN message_outgoing mo ON m.id = mo.id
WHERE m.recipient_id = 1
AND mi .trash = 1
AND mi .deleted = 0
OR m.originator_id = 1
AND mo .trash = 1
AND mo .deleted =0
AND mo .sent = 1
ORDER by date DESC
我试了一下，通过查询生成器：
$queryBuilder = $this->entityManager->getRepository('EzxWebmailBundle:Message')
   ->createQueryBuilder('m')
   ->select('m.id','m.subject','m.date')
   ->join('m.message_outgoing','mo','ON','m.id = mo.id')
   ->join('m.message_incoming','mi','ON','m.id = mi.id')
   ->where('m.recipient_id = '.$userId)
   ->andWhere('mi.trash = 1')
   ->andWhere('mi.deleted = 0')
   ->orWhere('m.originator_id = '.$userId)
   ->andWhere('mo.trash = 1')
   ->andWhere('mo.deleted = 0')
   ->andWhere('mo.sent = 1')
   ->orderBy('m.date','DESC');
$result = $queryBuilder->getQuery()->getResult();
令人惊讶的是如何返回不正确的结果！于是，我就看到查询为：
var_dump($queryBuilder->getQuery());
我真的不知道为什么doctrine产生额外的括号，因为我得到这样的结果（仔细看一下地点：
SELECT m.id, m.subject, m.date FROM message m
INNER JOIN message_outgoing mo ON m.id = mo.id
INNER JOIN message_incoming mi ON m.id = mi.id
WHERE ((m.recipient_id = 1 AND mi.trash = 1 AND mi.deleted = 0) OR m.originator_id = 1) AND mo.trash = 1 AND mo.deleted = 0 AND mo.sent = 1
ORDER BY m.date DESC
所以这一定是正确的，如果我想补充我自己的parenthsis：
$queryBuilder = $this->entityManager->getRepository('EzxWebmailBundle:Message')
   ->createQueryBuilder('m')
   ->select('m.id','m.subject','m.date')
   ->join('m.message_outgoing','mo','ON','m.id = mo.id')
   ->join('m.message_incoming','mi','ON','m.id = mi.id')
   ->where('(m.recipient_id = '.$userId)
   ->andWhere('mi.trash = 1')
   ->andWhere('mi.deleted = 0)')
   ->orWhere('(m.originator_id = '.$userId)
   ->andWhere('mo.trash = 1')
   ->andWhere('mo.deleted = 0')
   ->andWhere('mo.sent = 1)')
   ->orderBy('m.date','DESC')