HQL的子查询什么都不返回

Question

我正在运行以下HQL：

for(var prop in data) {
    var obj = {
        name: prop.name,
        description: prop.description,
        professor: prop.professor
    };
    console.log(obj); // U can use this obj object to applu your further logic
}

但是什么也没回来，有人可以告诉我为什么吗？
我希望输出像这样：

hive>select period,count(*) from
(select case when hour(a.first_time)>=21 and hour(a.first_time)<24 then'21-24'
             when hour(a.first_time)>=12 and hour(a.first_time)<21 then'12-21'
             else '0-12'
             end as period
             from longyuan_web.tv_log as a ) p1
group by period;

非常感谢你！