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https://issues.apache.org/jira/browse/PIG-5338?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16436129#comment-16436129
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Greg Phillips commented on PIG-5338:
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[~knoguchi] - I almost have the patch available. I should be able to post it
today once I have finished the unit tests.
> Prevent deep copy of DataBag into Jython List
> ---------------------------------------------
>
> Key: PIG-5338
> URL: https://issues.apache.org/jira/browse/PIG-5338
> Project: Pig
> Issue Type: Improvement
> Reporter: Greg Phillips
> Priority: Major
>
> Pig Python UDFs currently perform deep copies on Bags converting them into
> Jython PyLists. This can cause Jython UDFs to run out of memory and fail. A
> Jython DataBag which extends PyList could allow for iterative access to
> DataBag elements, while only performing a deep copy when necessary.
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