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From "Tom White (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HADOOP-4070) [Hive] Provide a mechanism for registering UDFs from the query language
Date Thu, 11 Sep 2008 16:21:54 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-4070?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Tom White updated HADOOP-4070:
------------------------------

    Attachment: hadoop-4070.patch

This patch extends the grammar to support creating UDFs.

For example you can do
{noformat}
CREATE FUNCTION my_udf AS com.example.MyUdf;
{noformat}
then use the my_udf function just like any other function.

The class defining the UDF (com.example.MyUdf) should be packed in a jar file then made available
to hive by setting the HIVE_AUX_JARS_PATH environment variable (which specifies the directory
that the jar is in).

Note that there is a change in ExecDriver which removes some code that was setting the "tmpjars"
property incorrectly. The problem was that the paths were not have the "file://" scheme prepended
to them as GenericOptionsParser does, which caused the paths to be interpreted as HDFS paths.
By removing the code GenericOptionsParser sets the variable correctly.

I have tested it manually on a simple UDF, the next step is to write some automated tests.

> [Hive] Provide a mechanism for registering UDFs from the query language
> -----------------------------------------------------------------------
>
>                 Key: HADOOP-4070
>                 URL: https://issues.apache.org/jira/browse/HADOOP-4070
>             Project: Hadoop Core
>          Issue Type: New Feature
>          Components: contrib/hive
>            Reporter: Tom White
>         Attachments: hadoop-4070.patch
>
>
> UDFs (user defined functions) in Hive are currently actually built-in functions. This
issue is to develop a packaging and registration mechanism so users can add their own functions
at runtime.

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