[jira] Assigned: (HIVE-1528) JSON UDTF function

["Ning Zhang (JIRA)" <ji...@apache.org>]

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

Ning Zhang reassigned HIVE-1528:
--------------------------------

    Assignee: Ning Zhang

> 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.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). 

-- 
This message is automatically generated by JIRA.
-
You can reply to this email to add a comment to the issue online.