问题 In symfony2, doctrine2, I have a query which triggers an error : Error "1038 Out of sort memory, consider increasing server sort buffer size The query : $queryBuilder = $this ->createQueryBuilder('object') ->leftJoin('object.objectCategory', 'c') ->leftJoin('object.medias', 'm') ->leftJoin('object.recipients', 'r') ->leftJoin('object.answers', 'a') ->leftJoin('object.tags', 't') ->leftJoin('object.user', 'u') ->leftJoin('object.votes', 'v') ->leftJoin('object.comments', 'comments') ->leftJoin