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From "Edward Capriolo (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HIVE-471) A UDF for simple reflection
Date Thu, 15 Jul 2010 00:45:51 GMT

     [ https://issues.apache.org/jira/browse/HIVE-471?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Edward Capriolo updated HIVE-471:
---------------------------------

    Attachment: HIVE-471.4.patch

> 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
>    Affects Versions: 0.5.1
>            Reporter: Edward Capriolo
>            Assignee: Edward Capriolo
>            Priority: Minor
>         Attachments: hive-471-gen.diff, HIVE-471.1.patch, HIVE-471.2.patch, HIVE-471.3.patch,
HIVE-471.4.patch, 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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