date_add函数获取后一天日期：
Time taken: 0.074 seconds, Fetched: 1 row(s)
hive (default)> select date_add(from_unixtime(unix_timestamp(),'yyyy-MM-dd'),1);
unix_timestamp(void) is deprecated. Use current_timestamp instead.
OK
_c0
2019-05-31
Time taken: 0.097 seconds, Fetched: 1 row(s)
hive (default)>