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From "Carl Steinbach (JIRA)" <>
Subject [jira] Updated: (HIVE-1528) JSON UDTF function
Date Mon, 03 Jan 2011 12:30:47 GMT


Carl Steinbach updated HIVE-1528:

    Component/s: UDF

> JSON UDTF function
> ------------------
>                 Key: HIVE-1528
>                 URL:
>             Project: Hive
>          Issue Type: New Feature
>          Components: UDF
>    Affects Versions: 0.7.0
>            Reporter: Ning Zhang
>            Assignee: Ning Zhang
>             Fix For: 0.7.0
>         Attachments: HIVE-1528.2.patch, 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
> 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, 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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