Alan Gates commented on PIG-928:

A couple thoughts:

1) I still have to figure out how to do type translation in BSF.  The current 
patch just assumes one string argument and then does reflection on the fly on 
return to figure out what it is returning.  We may or may not be able to expose 
schemas to scripted UDFs (ala outputSchema and argToFuncMapping) but we at 
least need to handle multiple and non-string arguments.  I need to do more 
digging in order to understand how to do this type translation in BSF.

2) For at least some either jython or jruby we've got to show better than a 30x 
differential.  There are some products you're just too embarrassed to sell.  We 
may be able to speed this up some by having the framework figure out the return 
type for this UDF and always convert the returning object based on that return 
type rather than trying to do reflection.

I don't know ruby or python, and I don't have time at the moment to go learn 
either.  If someone is willing to give me snippets of python and/or ruby that 
mimic the split functionality given in the patch, I'm happy to test against 
those two in BSF and see what happens.

> UDFs in scripting languages
> ---------------------------
>                 Key: PIG-928
>                 URL: https://issues.apache.org/jira/browse/PIG-928
>             Project: Pig
>          Issue Type: New Feature
>            Reporter: Alan Gates
>         Attachments: package.zip
> It should be possible to write UDFs in scripting languages such as python, 
> ruby, etc.  This frees users from needing to compile Java, generate a jar, 
> etc.  It also opens Pig to programmers who prefer scripting languages over 
> Java.

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