Hive：加入字符串列数组

Question

我有一个HIVE表，其代码如下：

hive>desc books;
gen_id                  int                                         
author                  array<string>                               
rating                  double                               
genres                  array<string>  

hive>select * from books;

| gen_id         | rating    | author          |genres
+----------------+-------------+---------------+----------
| 1              | 10        | ["A","B"]       | ["X","Y"]  
| 2              | 20        | ["C","A"]       | ["Z","X"]
| 3              | 30        | ["D"]           | ["X"]

是否存在可以执行某些SELECT操作并返回单个行的查询，如下所示：

| gen_id      |  rating        | JoinData
+-------------+---------------+-------------
| 1           | 10            | ["A","B","X","Y"]
| 2           | 20            | ["C","A","Z","X"]
| 3           | 30            | ["D","X"]
| 1           | 10            | "Y"

有人可以指导我如何获得这个结果。提前感谢您的任何帮助。

Answer 1

答案在这篇文章中：   
[1]：http：//stackoverflow.com/questions/21578477/array-intersect-hive

对于那些不想进入主题的人来说：

1）使用UDF创建临时函数 CREATE TEMPORARY FUNCTION结合AS＆＃39; brickhouse.udf.collect.CombineUDF＆＃39 ;;

2）制作一个选择陈述

select gen_id
    , rating
    , combine(author, genres) as JoinData 
from books