hive表达式不按键大小分组

Question

我的表Schema是（State string，City String，Size int）

这是我的输入数据

Karnataka,Bangalore,200
Karnataka,Mysore,50
Karnataka,Bellary,100
Karnataka,Mangalore,10
Andhra pradesh,Chittoor, 25
Andhra pradesh,nellore, 15
Andhra pradesh,guntur, 20
Andhra pradesh,tirupathi, 30
Andhra pradesh,vizag, 35
Andhra pradesh,kadapa, 45

我想检索州的前两个城市以及大小，我想要输出如下。

(Andhra pradesh,{(35),(30)},{(vizag),(tirupathi)})
(Karnataka,{(200),(100)},{(Bangalore),(Bellary)})

我已经将查询写成如下，但我得到的错误是表达式不是按组大小，plz帮助我。

select * from statefile groyp by state,city order by size limit 2;

提前感谢。

Answer 1

您可以使用row_number()：

select sf.*
from (select sf.*,
             row_number() over (partition by state order by size desc) as seqnum
      from statefile sf
     ) sf
where seqnum <= 2;