hive:字符串转int
select start_time from os.os_cater_t_caf_info;
select cast(start_time AS BIGINT) aa from os.os_canter_t_calof_info;
select start_time from os.os_cater_t_caf_info;
select cast(start_time AS BIGINT) aa from os.os_canter_t_calof_info;