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https://issues.apache.org/jira/browse/HIVE-1528?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Ning Zhang updated HIVE-1528:
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Attachment: HIVE-1528.patch
> JSON UDTF function
> ------------------
>
> Key: HIVE-1528
> URL: https://issues.apache.org/jira/browse/HIVE-1528
> Project: Hadoop Hive
> Issue Type: New Feature
> Reporter: Ning Zhang
> Attachments: HIVE-1528.patch
>
>
> Currently the only way to evaluate a path expression on a JSON object is
> through get_json_object. If there are many fields in the JSON object need to
> be extract, we have to call this UDF multiple times.
> There are many use cases that get_json_object needs to be called many times
> in one query to convert the JSON object to a relational schema. It would be
> much desirable if we have a JSON UDTF that supports the following syntax:
> {code}
> select a.id, b.*
> from a lateral view json_table(a.json_object, '$.f1', '$.f2', ..., '$.fn') b
> as f1, f2, ..., fn
> {code}
> where the json_table function only scans the json_object once and return a
> set of tuple of (f1, f2,..., fn).
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