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From "Ashish Thusoo (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HIVE-471) A UDF for simple reflection
Date Tue, 05 May 2009 21:05:36 GMT

    [ https://issues.apache.org/jira/browse/HIVE-471?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12706196#action_12706196
] 

Ashish Thusoo commented on HIVE-471:
------------------------------------

nice idea. I like the concept.

You probably should use GenericUDF framework instead of the UDF framework. That way you will
be easily able to pass variable number of arguments to the function.


> A UDF for simple reflection
> ---------------------------
>
>                 Key: HIVE-471
>                 URL: https://issues.apache.org/jira/browse/HIVE-471
>             Project: Hadoop Hive
>          Issue Type: New Feature
>          Components: Query Processor
>            Reporter: Edward Capriolo
>            Assignee: Edward Capriolo
>            Priority: Minor
>             Fix For: 0.4.0
>
>         Attachments: hive-471.diff
>
>
> There are many methods in java that are static and have no arguments or can be invoked
with one simple parameter. More complicated functions will require a UDF but one generic one
can work as a poor-mans UDF.
> {noformat}
> SELECT reflect("java.lang.String", "valueOf", 1), reflect("java.lang.String", "isEmpty")
> FROM src LIMIT 1;
> {noformat}

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