Spring Data JPA分组统计

@Override
public EasyuiResult<List<StoreStatistics>> findAllmonthMoney(Integer page,Integer rows,String storeId,Map<String, Object> map) {
 Page<StoreStatistics> StoreStatistics = storeStatisticsDao.findAll(new Specification<StoreStatistics>() {
@Override
public Predicate toPredicate(Root<StoreStatistics> root,CriteriaQuery<?> query, CriteriaBuilder cb) {
query.multiselect(cb.sum(root.<Integer> get("month")).alias("month"));
query.groupBy(root.get("year"),root.get("month"));
if(map.get("EQ_year")!=null){
query.where(cb.equal(root.get("year"), map.get("EQ_year")),cb.equal(root.get("month"), map.get("EQ_month")),cb.equal(root.get("storeId"),storeId));
}else{
query.where(cb.equal(root.get("storeId"),storeId));
}
return null;
}
}, new PageRequest(page - 1, rows, new Sort(Sort.Direction.DESC, new String[] { "createdTime" })));
        return EasyUtils.returnPage(StoreStatistics.class, StoreStatistics);
SQL语句   select
        storestati0_.id as id1_70_,
        storestati0_.create_user as create_u2_70_,
        storestati0_.created_ip as created_3_70_,
        storestati0_.created_time as created_4_70_,
        storestati0_.day as day5_70_,
        storestati0_.lockversion as lockvers6_70_,
        storestati0_.month as month7_70_,
        storestati0_.update_time as update_t8_70_,
        storestati0_.year as year9_70_,
        storestati0_.merchant_mobile as merchan10_70_,
        storestati0_.monthly_income as monthly11_70_,
        storestati0_.store_id as store_i12_70_,
        storestati0_.store_name as store_n13_70_,
        storestati0_.today_income as today_i14_70_,
        storestati0_.total_income as total_i15_70_ 
    from
        wk_store_statistics storestati0_ 
    where
        storestati0_.store_id=40 
    group by
        storestati0_.year ,
        storestati0_.month 
    order by
        storestati0_.created_time desc limit ?query.multiselect(cb.sum(root.<Integer> get("month")).alias("month"));没有效果