Hibernate HQL连接获取不是递归获取

如果您知道树中只有两个级别，那么您是否考虑过加入更深的一个级别。像下面的东西？

SELECt DISTINCT domain FROM Domain domain   LEFT OUTER JOIN FETCH domain.operators operators1   LEFT OUTER JOIN FETCH domain.networkCodes   LEFT OUTER JOIN FETCH operators1.operators operators2   LEFT OUTER JOIN FETCH operators1.networkCodesWHERe domain.domainId = :domainId