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Date: Mon, 3 Jan 2011 07:32:45 -0500 (EST)
From: "Carl Steinbach (JIRA)" <jira@apache.org>
To: hive-dev@hadoop.apache.org
Subject: [jira] Updated: (HIVE-1528) Add json_tuple() UDTF function
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     [ https://issues.apache.org/jira/browse/HIVE-1528?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Carl Steinbach updated HIVE-1528:
---------------------------------

    Summary: Add json_tuple() UDTF function  (was: JSON UDTF function)

> Add json_tuple() UDTF function
> ------------------------------
>
>                 Key: HIVE-1528
>                 URL: https://issues.apache.org/jira/browse/HIVE-1528
>             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 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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