sql的explode函数

在查询数据时，当字段类型为array时候，无法直接查询这个字段，需要用explode来打开

例如

 

 

 

 查询clicks字段，需要用explode打开

select local_dt,s.name
from
(
    SELECT local_dt,
                explode(payload.clicks) as s
    from dts_obt.eventtypeclientclick 
    where dt BETWEEN '20200604' and '20200608'
    and local_dt between '20200605' and '20200607'
    and payload.region="BR"
) 

　　再例如

 

 

select 
       a.local_dt,
       sum(a.gems_delta)
from 
(select explode(del_items) as s,
       gems_delta,
       local_dt
from ff_facts.exchange_items_facts
where utc_8_dt between "20200115" and "20200119"
and   region = "TW") as a 
where a.gems_delta > 0
and   a.s.id = 400000128
group by a.local_dt
order by a.local_dt