Hive将数组炸开

split：按特定符号切分为数组
explode：将数组数据炸开，单个select限制一个explode
LATERAL VIEW：侧写函数，可以使explode同其他字段一起查询

select 
    distinct c1
    ,case 
        when c2 = 'A级' then c2 
        when LOCATE('线',c2)=0 then concat(c2,'线')
        else c2 end as c2
      ,c3 
      ,c4
  from table as a
  
  LATERAL VIEW explode(split(a.c1,',')) a AS c1
  LATERAL VIEW explode(split(a.c2,',')) a AS c2
  where a.ds = '${yyyyMMdd,-1d}'

单独使用情况下：

select 
    explode(split(c1,',') ) as c1
from table
where ds = '${yyyyMMdd,-1d}'

spilt以后的数据，

结果

select 
    distinct explode(split(region_code,',') ) as region_code
    
select distinct c1
from table_name as a
lateral view explode(split(region_code,',')) a as c1
where ds = '${yyyyMMdd,-1d}'