arrays - Hive - 从 Json 中提取数组

Question

我有一个包含一些值数组的表。

create external table apidetails
(
  inputdetails sting
)
Location 'XXXX'

select inputdetails from apidetails

{ "Name": "api-server1", "ID": "api-1", "tags": ["tag-1","tag-2"] }

我需要结果

| 身份证 | 标签 |

|-------|---------------|

|api-1| 标签-1，标签-2|

我尝试了 select json_extract_scalar(inputdetails ,'$tags')，但它返回错误。

Answer 1

这里有几个选项：

选项 1：JSON

select  json_extract_scalar(inputdetails ,'$.ID') as ID
       ,json_extract(inputdetails ,'$.tags')      as tags

from    apidetails
;

---

  ID   |       tags
-------+-------------------
 api-1 | ["tag-1","tag-2"]

选项 2：数组（varchar）

select  json_extract_scalar(inputdetails ,'$.ID')                       as ID
       ,cast(json_extract(inputdetails ,'$.tags') as array(varchar))    as tags

from    apidetails
;

---

  ID   |      tags
-------+----------------
 api-1 | [tag-1, tag-2]

选项 3：分隔字符串

select  json_extract_scalar(inputdetails ,'$.ID')                                       as ID
       ,array_join(cast(json_extract(inputdetails ,'$.tags') as array(varchar)),',')    as tags

from    apidetails
;

---

  ID   |    tags
-------+-------------
 api-1 | tag-1,tag-2