hive 如何提取json 数组的某一字段

背景：

提取json中某个字段的故事，get_json_object，但是发现好像不能直接提取数组

尝试使用

split(regexp_replace(substr(contacts, 2, length(contacts)-2), '"}","', '"}",,,,"'), ',,,,')) 

之后提取失败～ 提取内容基本如下

[{"userId":89224,"contactName":"","contactPhone":"+","originPhone":"+"},

{"userId":89223,"contactName":"","contactPhone":"+","originPhone":""},

{"userId":89221,"contactName":"","contactPhone":"+","originPhone":"+"}]

还是直接放方案吧 '$[*]' 推荐

select user_id, get_json_object(contacts,'$[*].userId') as cons
from XXXX 

你就会得到 类似如下的内容

	user_id	cons
1	107521212	[8397213,85,7418687,304388953,198708241,148,111920,5285539,97773639]

 

但是还不够 我想要生成映射map

此时推荐 ：

LATERAL VIEW explode (split(substr(t.cons, 2, length(t.cons)-2) , ','))  temp as contact_id 

关于 explode 和  LATERAL VIEW 的用法 可以自行百度 不容踩坑

最终写法：完成列转行和映射关系 

SELECT t.user_id as user_id , contact_id from (
select user_id, get_json_object(contacts,'$[*].userId') as cons
from phone_contacts
WHERE dt = '2020-06-27') as t 
LATERAL VIEW explode (split(substr(t.cons, 2, length(t.cons)-2) , ',')) temp as contact_id