内部联接在JSON列表中列出的键

Question

我有一个json喜欢：

{"key": [1,2], "group": 1}
{"key": [1,3], "group": 2}

我将我的json加载到hive中，我想在数据库中的另一个表上使用这些键进行内连接。

结果应该类似

Group  Value
  1    "this is some value corresponding to 1 in another table" 
  1    "this is some value corresponding to 2"
  2    "this is some value corresponding to 1"
  2    "this is some value corresponding to 3"

这是一个基本的内置功能，还是我需要有创意？

Answer 1

select      kg.group,k.value 
from                      my_json_table                                               jt
            lateral view  json_tuple(jt.my_json_column,'key','group')                 kg as key,group 
            lateral view  explode (split(regexp_extract(kg.key,'\\[(.*)\\]',1),','))  k  as value
;

https://cwiki.apache.org/confluence/display/Hive/LanguageManual+UDF