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https://issues.apache.org/jira/browse/FLINK-2723?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14902499#comment-14902499
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Stephan Ewen commented on FLINK-2723:
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+1, good idea
It would be breaking in the APIs, but I think the {{CopyableValue}} is not
frequently used.
> CopyableValue method to copy into new instance
> ----------------------------------------------
>
> Key: FLINK-2723
> URL: https://issues.apache.org/jira/browse/FLINK-2723
> Project: Flink
> Issue Type: New Feature
> Components: Core
> Affects Versions: master
> Reporter: Greg Hogan
> Assignee: Greg Hogan
> Priority: Minor
>
> Provide a method for generic user-defined functions to clone a
> {{CopyableValue}}. A common use case is a {{GroupReduceFunction}} that needs
> to store multiple objects. With object reuse we need to make a deep copy and
> with type erasure we cannot call new.
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