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From "Mohammad Kamrul Islam (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HIVE-5306) Use new GenericUDF instead of basic UDF for UDFAbs class
Date Thu, 19 Sep 2013 00:18:52 GMT

     [ https://issues.apache.org/jira/browse/HIVE-5306?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Mohammad Kamrul Islam updated HIVE-5306:
----------------------------------------

    Attachment: HIVE-5306.4.patch

Updated with [~jdere]'s review comments.

                
> Use new GenericUDF instead of basic UDF for UDFAbs class
> --------------------------------------------------------
>
>                 Key: HIVE-5306
>                 URL: https://issues.apache.org/jira/browse/HIVE-5306
>             Project: Hive
>          Issue Type: Improvement
>          Components: UDF
>            Reporter: Mohammad Kamrul Islam
>            Assignee: Mohammad Kamrul Islam
>         Attachments: HIVE-5306.1.patch, HIVE-5306.2.patch, HIVE-5306.3.patch, HIVE-5306.4.patch
>
>
> GenericUDF class is the latest  and recommended base class for any UDFs.
> This JIRA is to change the current UDFAbs class extended from GenericUDF.
> The general benefit of GenericUDF is described in comments as 
> "* The GenericUDF are superior to normal UDFs in the following ways: 1. It can
>  * accept arguments of complex types, and return complex types. 2. It can accept
>  * variable length of arguments. 3. It can accept an infinite number of function
>  * signature - for example, it's easy to write a GenericUDF that accepts
>  * array<int>, array<array<int>> and so on (arbitrary levels of nesting).
4. It
>  * can do short-circuit evaluations using DeferedObject."  

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