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https://issues.apache.org/jira/browse/SPARK-31009?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17049914#comment-17049914
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Rakesh Raushan commented on SPARK-31009:
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[~hyukjin.kwon] I updated the description. PostgreSQL supports this function.
We can use `from_json` to convert json to `MapType` and then extract the keys,
but that won't be optimal.
Apart from this one, there are some json function that supported by PostgreSQL,
prestro, redshift,teradata.
May be we can discuss on supporting some of them. I have already raised a PR
for `json_array_length`. This is supported by all of the above mentioned DBMSs.
> 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: 3.0.0
> Reporter: Rakesh Raushan
> Priority: Major
>
> This function will return all the keys from outer json object.
>
> PostgreSQL support this function ->
> [https://www.postgresql.org/docs/9.3/functions-json.html]
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