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From "Christopher, Pat" <patrick.christop...@hp.com>
Subject RE: UDF of processing a column like pig?
Date Mon, 28 Mar 2011 18:45:58 GMT
I think so.  I haven't looked for a non-java API though.

Pat

From: Michael Jiang [mailto:it.mjjiang@gmail.com]
Sent: Monday, March 28, 2011 11:31 AM
To: user@hive.apache.org
Cc: Christopher, Pat
Subject: Re: UDF of processing a column like pig?

Thanks, so, I guess only java is supported, right?
On Mon, Mar 28, 2011 at 11:27 AM, Christopher, Pat <patrick.christopher@hp.com<mailto:patrick.christopher@hp.com>>
wrote:
You can create UDFs, UDAFs and UDTFs.  http://wiki.apache.org/hadoop/Hive/HivePlugins

Pat

From: Michael Jiang [mailto:it.mjjiang@gmail.com<mailto:it.mjjiang@gmail.com>]
Sent: Monday, March 28, 2011 11:13 AM
To: user@hive.apache.org<mailto:user@hive.apache.org>
Subject: UDF of processing a column like pig?

I want to have a function that returns the hour information from a date string (wiz not a
known format supported by current date functions, but basically this is just a use case example).
In pig, you can create a UDF (user defined function) and apply it to a column. Is there an
equivalent thing in Hive? I know I can write a mapper to take whole line and transform the
specific column I want. But it's not convenient because you have to duplicate the same code
for each different source table.

Thanks!


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