[jira] [Updated] (PIG-1942) script UDF (jython) should utilize the intended output schema to more directly convert Py objects to Pig objects

["Alan Gates (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/PIG-1942?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Alan Gates updated PIG-1942:
----------------------------

    Status: Open  (was: Patch Available)

Marking open pending response to Thejas' comments.
                
> script UDF (jython) should utilize the intended output schema to more directly convert Py objects to Pig objects
> ----------------------------------------------------------------------------------------------------------------
>
>                 Key: PIG-1942
>                 URL: https://issues.apache.org/jira/browse/PIG-1942
>             Project: Pig
>          Issue Type: Improvement
>          Components: impl
>    Affects Versions: 0.9.0, 0.8.0
>            Reporter: Woody Anderson
>            Assignee: Woody Anderson
>            Priority: Minor
>              Labels: python, schema, udf
>         Attachments: 1942.patch, 1942_with_junit.patch
>
>
> from https://issues.apache.org/jira/browse/PIG-1824
> {code}
> import re
> @outputSchema("y:bag{t:tuple(word:chararray)}")
> def strsplittobag(content,regex):
>         return re.compile(regex).split(content)
> {code}
> does not work because split returns a list of strings. However, the output schema is known, and it would be quite simple to implicitly promote the string element to a tupled element.
> also, a list/array/tuple/set etc. are all equally convertable to bag, and list/array/tuple are equally convertable to Tuple, this conversion can be done in a much less rigid way with the use of the schema.
> this allows much more facile re-use of existing python code and less memory overhead to create intermediate re-converting of object types.
> I have written the code to do this a while back as part of my version of the jython script framework, i'll isolate that and attach.

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