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Date: Wed, 14 Mar 2012 01:08:40 +0000 (UTC)
From: "Jonathan Coveney (Updated) (JIRA)" <jira@apache.org>
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Subject: [jira] [Updated] (PIG-2551) Create an AlgebraicEvalFunc and
 AccumulatorEvalFunc abstract class which gives you the lower levels for
 free
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     [ https://issues.apache.org/jira/browse/PIG-2551?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Jonathan Coveney updated PIG-2551:
----------------------------------

    Attachment: PIG-2551-3.patch

Woops, thought I had gotten them all. Here you go!
                
> Create an AlgebraicEvalFunc and AccumulatorEvalFunc abstract class which gives you the lower levels for free
> ------------------------------------------------------------------------------------------------------------
>
>                 Key: PIG-2551
>                 URL: https://issues.apache.org/jira/browse/PIG-2551
>             Project: Pig
>          Issue Type: Improvement
>            Reporter: Jonathan Coveney
>            Assignee: Jonathan Coveney
>            Priority: Minor
>             Fix For: 0.11
>
>         Attachments: PIG-2551-0.patch, PIG-2551-1.patch, PIG-2551-2.patch, PIG-2551-3.patch
>
>
> This is more of a win for the Algebraic interface than the Accumulator interface, but the idea is that if you implement the Algebraic interface, you should get Accumulator/EvalFunc for free, and if you implement Accumulator, you should get EvalFunc for free. The win of this is that in cases such as JRuby, you don't have to muck around doing this yourself...you have them implement the algebraic portion, and the rest comes free (that is where this came out of, but I feel like it is generally useful enough).
> The next piece of work I'd like to do is making an easier to implement way to make Algebraic UDFs, but then again, my to do is huge :) Would love thoughts on this. If it doesn't make it into Pig, it's still going to come in the JRuby stuff, so I thought it'd at least be worth having it separate, tested, and available to everyone.

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