hive does not output in scientific notation

Source: http://blog.csdn.net/u010670689/article/details/44748131
Comments:
1. Original sql:
sum(online_time) num

output:
Small R 2.6014523E7
R 3881104
Big R 356963

2. Converted sql :
cast(sum(online_time) as bigint) num

output:
small R 26014523
medium R 3881104
big R 356963