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From "Edward Capriolo (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HIVE-45) Hive: GenericUDF and support of complex object
Date Tue, 05 May 2009 19:13:30 GMT

    [ https://issues.apache.org/jira/browse/HIVE-45?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12706163#action_12706163
] 

Edward Capriolo commented on HIVE-45:
-------------------------------------

I just put in a Jira for [https://issues.apache.org/jira/browse/HIVE-471]. I realize this
jira adds support for some if not all of the things I was looking to do. 

Without getting over generic I would have liked to support. 

{noformat}
evalautate(String, String,Object[])
{noformat}

As well as 

{noformat}
 evaluate(  evalautate(String, String,Object[]), "getName", "this", "that")
{noformat}

It seems like what you are doing here makes that possible.




> Hive: GenericUDF and support of complex object
> ----------------------------------------------
>
>                 Key: HIVE-45
>                 URL: https://issues.apache.org/jira/browse/HIVE-45
>             Project: Hadoop Hive
>          Issue Type: Bug
>          Components: Query Processor
>            Reporter: Zheng Shao
>            Assignee: Zheng Shao
>             Fix For: 0.4.0
>
>
> GenericUDF are more powerful than UDF 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. 

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