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https://issues.apache.org/jira/browse/HIVE-4396?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13765449#comment-13765449
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Brock Noland commented on HIVE-4396:
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HIVE-5263 improved the time for complex cases, but as discussed there our new
serialization framework also allows for cheap copies using the Kyro.copy()
method.
> Create a efficient method to create a deep copy of a mapredwork
> ----------------------------------------------------------------
>
> Key: HIVE-4396
> URL: https://issues.apache.org/jira/browse/HIVE-4396
> Project: Hive
> Issue Type: Improvement
> Components: Query Processor
> Reporter: Namit Jain
>
> In many optimization steps, we create a copy of the query plan and then
> change some parts of it.
> Currently, the only reliable way to do so is to serialize and deserialize it,
> which is fairly expensive.
> It would be very useful to have a cheaper method to do the same.
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