Hive常用语法

SELECT CONCAT_WS('.',split('a.b.c.d','\\.')[0],split('a.b.c.d','\\.')[1],split('a.b.c.d','\\.')[2]);

SELECT a.*
FROM
(
  SELECT t.*,row_num()over(partition BY package_name,order BY row) as row_num
  from t
) a
WHERE a.row_num=1

add jar path/xxxxx.jar;
create temporary function function_name as 'com.company.function_name';

reflect('java.net.URLDecoder', 'decode',XXXXXX ,"UTF-8")

load DATA LOCAL inpath ''
​​​​​​​overwrite into TABLE table_name;