hive 每组取topn

原groupby 逻辑:

根据 user_id 聚合拼接tag的值

SELECt 
user_id_value, 
concat_ws(';',collect_set(tag_id)) 
FROM inputTable
group by user_id_value

现在需要在此基础上, 根据score字段取topn:

SELECt 
user_id_value, 
concat_ws(';',collect_set(tag_id)) 
FROM (
    SELECt 
    user_id_value, 
    tag_id, 
    row_number() over (partition by user_id_value order by score desc ) id_rank,
    score 
    FROM (
        SELECt user_id_value, tag_id, score FROM inputTable 
    )a  
)b
WHERe id_rank < 10
group by user_id_value

参考:

hive分组排序 取top N_longshenlmj的专栏-CSDN博客_hive分组排序取top
user defined functions - Hive getting top n records in group by query - Stack Overflow