hive中两数组类型的数据进行整合(array[])

1、
–dws层经过处理后的数据

select
  table1.user_id as user_id ,
  table1.read_book_id as arrays 
  --arrays字段在dws_qy_profile_reads_stat ,中该字段为 array[]类型的数据
 
from 
   dws_reads  table1 ;

分析历史数据中的具体某一条数据

2、
–dwd_qy_profile_cpsshardn_user_recently_read表提供增量数据数据来源
–统计每天的数据按照user_id字段进行聚合收集 book_id字段,
–收集后的数据集放在arrays字段中

select
  table2.user_id  as user_id,
  collect_set(table2.book_id) as arrays
from 
  dwd_recently_read table2
where  
  year = '2022' --${year}
and
  month = '03'  --${month}
and
  day = '02'  --${day}
group by
  table2.user_id ;

增量数据中的具体某一条

3、
–统计用户阅读过的书籍
–让历史数据跟增量数据进行整合
–先将两个数组字段中的集合值进行炸开(与视图配合使用)

select
  temp.user_id as user_id,
adid

from (
select
  table1.user_id as user_id ,
  table1.read_book_id as arrays
from 
  dws_reads    table1 

union all
select
  table2.user_id  as user_id,
  collect_set(table2.book_id) as arrays
from 
  dwd_recently_read table2
where  
  year = '2022' --${year}
and
  month = '03'  --${month}
and
  day = '02'  --${day}
group by
  table2.user_id 
) temp LATERAL VIEW explode(temp.arrays) adTable AS adid  
--adTable 视图别名 ,adid 新列名

炸开后的结果：

"10072771"  "10072771"  "10072771" "10072771"

4、
–然后在按照用户进行聚合

select
  tt.user_id,
  --tt.adid,
  collect_set(tt.adid)
from  
(  
select
  temp.user_id as user_id,
  adid

from (
select
  table1.user_id as user_id ,
  table1.read_book_id as arrays
from 
  dws_reads  table1 

union all

select
  table2.user_id  as user_id,
  collect_set(table2.book_id) as arrays
from 
  dwd_recently_read table2
where  
  year = '2022' --${year}
and
  month = '03'  --${month}
and
  day = '02'  --${day}
group by
  table2.user_id 
) temp LATERAL VIEW explode(temp.arrays) adTable AS adid  
--adTable 视图别名 ,adid 新列名

)tt 
group by user_id;  --24条数据

聚合去重后的结果：(这里是由于巧合，历史数据跟新增数据完全一样，如果新增数据跟历史数据不一样，聚合去重后的数据，数组中就会新增元素)