@Query("select clusters.id, " +
        "sum(greatest(frequencies.january, " +
        "frequencies.february, " +
        "frequencies.march, " +
        "frequencies.april, " +
        "frequencies.may, " +
        "frequencies.june, " +
        "frequencies.july, " +
        "frequencies.august, " +
        "frequencies.september, " +
        "frequencies.october, " +
        "frequencies.november, " +
        "frequencies.december)) summedFrequency " +
        "from ClusterEntity clusters " +
        "left join PhraseEntity phrases on phrases.cluster.id=clusters.id " +
        "left join FrequencyEntity frequencies on frequencies.phrase.id=phrases.id " +
        "where clusters.page.id = :page_id " +
        "group by clusters.id "
)
List<ClusterEntity> findAllClustersByPage(@Param("page_id") Integer pageId);

此方法肯定不会返回ClusterEntity的列表。
你能告诉我当我执行一些任意的查询时返回什么吗？