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From "Dmitriy V. Ryaboy (JIRA)" <j...@apache.org>
Subject [jira] Updated: (PIG-1551) Improve dynamic invokers to deal with no-arg methods and array parameters
Date Tue, 24 Aug 2010 19:21:18 GMT

     [ https://issues.apache.org/jira/browse/PIG-1551?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Dmitriy V. Ryaboy updated PIG-1551:

    Attachment: PIG_1551.3.patch

Ugh. Thank you for catching that -- fixed, and added a test to make sure it stays fixed.

The particular set of methods I needed this for used primitives, so that's what I did. It's
a bit tricky to add support for Long, Double, etc arrays, as I would have to check all combinations
of possible method signatures when seeing things like (int[], int[], int[]) -- it becomes
fairly ugly code.. Do you think this is particularly compelling? I can't really think of methods
that take arrays of Number classes; usually, if you start using Numbers, you are also using
Collections, not plain arrays.

> Improve dynamic invokers to deal with no-arg methods and array parameters
> -------------------------------------------------------------------------
>                 Key: PIG-1551
>                 URL: https://issues.apache.org/jira/browse/PIG-1551
>             Project: Pig
>          Issue Type: Improvement
>    Affects Versions: 0.8.0
>            Reporter: Dmitriy V. Ryaboy
>            Assignee: Dmitriy V. Ryaboy
>             Fix For: 0.8.0
>         Attachments: PIG-1551.patch, PIG_1551.2.patch, PIG_1551.3.patch
> PIG-1354 introduced a set of UDFs that can be used to dynamically wrap simple Java methods
in a UDF, so that users don't need to create trivial wrappers if they are ok sacrificing some
> This issue is to extend the set of methods that can be wrapped this way to include methods
that do not take any arguments, and methods that take arrays of {int,long,float,double,string}
as arguments. 
> Arrays are expected to be represented by bags in Pig. Notably, this allows users to wrap
statistical functions in o.a.commons.math.stat.StatUtils . 

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