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https://issues.apache.org/jira/browse/SPARK-31009?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17054251#comment-17054251
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Takeshi Yamamuro commented on SPARK-31009:
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I saw you working on the implementations of new json functions. If you wanna
make more PRs for these functions, (to make it easier to see your activity from
other developers), I think you'd be better to list up all the json functions
first in a parent Jira that you're planning to work on. Also, I think it might
be worth documenting these functions somewhere just like the PostgreSQL one:
[https://www.postgresql.org/docs/current/functions-json.html]
> Support json_object_keys function
> ---------------------------------
>
> Key: SPARK-31009
> URL: https://issues.apache.org/jira/browse/SPARK-31009
> Project: Spark
> Issue Type: New Feature
> Components: SQL
> Affects Versions: 3.1.0
> Reporter: Rakesh Raushan
> Priority: Major
>
> This function will return all the keys from outer json object.
>
> PostgreSQL -> [https://www.postgresql.org/docs/9.3/functions-json.html]
> Mysql ->
> [https://dev.mysql.com/doc/refman/8.0/en/json-function-reference.html]
> MariaDB -> [https://mariadb.com/kb/en/json-functions/]
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