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From "Ning Zhang (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HIVE-1528) JSON UDTF function
Date Fri, 13 Aug 2010 01:23:16 GMT

     [ https://issues.apache.org/jira/browse/HIVE-1528?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Ning Zhang updated HIVE-1528:
-----------------------------

    Attachment: HIVE-1528.2.patch

Based on offline discussion with Paul, added a new unit test of putting json_tuple in the
select clause. Also removed temporary changes in UDFJson.java.

> JSON UDTF function
> ------------------
>
>                 Key: HIVE-1528
>                 URL: https://issues.apache.org/jira/browse/HIVE-1528
>             Project: Hadoop Hive
>          Issue Type: New Feature
>    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
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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