Hive 窗口函数如何设置窗口大小

select city,year,taxes,
 
sum(money) over() as sample1,--所有行相加
 
sum(money) over(partition by city) as sample2,--按city分组，组内数据相加
 
sum(money) over(partition by city order by year) as sample3,--按city分组，组内数据累加
 
sum(money) over(partition by city order by year rows between UNBOUNDED PRECEDING and current row ) as sample4 ,--和sample3一样,由起点到当前行的聚合
 
sum(money) over(partition by city order by year rows between 1 PRECEDING and current row) as sample5, --当前行和前面一行做聚合
 
sum(money) over(partition by city order by year rows between 1 PRECEDING and 1 FOLLOWING ) as sample6,--当前行和前边一行及后面一行
 
sum(money) over(partition by city order by year rows between current row and UNBOUNDED FOLLOWING ) as sample7 --当前行及后面所有行
 
from business;