[英]How to extract a JSON value in Hive
I Have a JSON string that is stored in a single cell in the DB corresponding to a parent ID我有一个 JSON 字符串,它存储在数据库中与父 ID 对应的单个单元格中
{"profileState":"ACTIVE","isDefault":"true","joinedOn":"2019-03-24T15:19:52.639Z","profileType":"ADULT","id":"abc","signupDeviceId":"1"}||{"profileState":"ACTIVE","isDefault":"true","joinedOn":"2021-09-05T07:47:00.245Z","imageId":"19","profileType":"KIDS","name":"Kids","id":"efg","signupDeviceId":"1"}
Now I want to use the above JSON to extract the id from this.现在我想使用上面的 JSON 从中提取 id。 Let say we have data like假设我们有这样的数据
Parent ID | Profile JSON
1 | {profile_json} (see above string)
I want the output to look like this我希望 output 看起来像这样
Parent ID | ID
1 | abc
1 | efg
Now, I've tried a couple of iterations to solve this现在,我尝试了几次迭代来解决这个问题
First Approach:第一种方法:
select
get_json_object(p.profile, '$$.id') as id,
test.parent_id
from (
select split(
regexp_replace(
regexp_extract(profiles, '^\\[(.+)\\]$$',1),
'\\}\\,\\{', '\\}\\|\\|\\{'),
'\\|\\|') as profile_list,
parent_id ,
from source_table) test
lateral view explode(test.profile_list) p as profile
)
But this is returning the id
column as having NULL values.但这返回的id
列具有 NULL 个值。 Is there something I'm missing here.我在这里缺少什么吗?
Second Approach:第二种方法:
with profiles as(
select regexp_replace(
regexp_extract(profiles, '^\\[(.+)\\]$$',1),
'\\}\\,\\{', '\\}\\|\\|\\{') as profile_list,
parent_id
from source_table
)
SELECT
get_json_object (t1.profile_list,'$.id')
FROM profiles t1
The second approach is only returning the first id ( abc
) as per the above JSON string.第二种方法是根据上面的 JSON 字符串只返回第一个 id ( abc
)。
I tried to replicate this in apache hive v4.我试图在 apache hive v4 中复制它。
Data数据
+----------------------------------------------------+------------------+
| data | parent_id |
+----------------------------------------------------+------------------+
| {"profileState":"ACTIVE","isDefault":"true","joinedOn":"2019-03-24T15:19:52.639Z","profileType":"ADULT","id":"abc","signupDeviceId":"1"}||{"profileState":"ACTIVE","isDefault":"true","joinedOn":"2021-09-05T07:47:00.245Z","imageId":"19","profileType":"KIDS","name":"Kids","id":"efg","signupDeviceId":"1"} | 1.0 |
+----------------------------------------------------+------------------+
Sql sql
select pid,get_json_object(expl_jid,'$.id') json_id from
(select parent_id pid,split(data,'\\|\\|') jid from tabl1)a
lateral view explode(jid) exp_tab as expl_jid;
+------+----------+
| pid | json_id |
+------+----------+
| 1.0 | abc |
| 1.0 | efg |
+------+----------+
Solve this.解决这个问题。 Was using a extract $ in the First Approach在第一种方法中使用提取 $
select
get_json_object(p.profile, '$.id') as id,
test.parent_id
from (
select split(
regexp_replace(
regexp_extract(profiles, '^\\[(.+)\\]$$',1),
'\\}\\,\\{', '\\}\\|\\|\\{'),
'\\|\\|') as profile_list,
parent_id ,
from source_table) test
lateral view explode(test.profile_list) p as profile
) )
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