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https://issues.apache.org/jira/browse/HIVE-5503?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13805966#comment-13805966
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Sergey Shelukhin commented on HIVE-5503:
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I have basically moved a lot of logic around TopN from ReduceSink to TopNHash,
so TopNHash itself can handle flushing, disabling etc.
Also, the different behavior for different cases is now covered by a small
private interface, not by entire class, so it doesn't have to be visible
outside.
Finally, after that, vectorized batch processing has been added. It adds all
keys to heap; then forwards or stores values for the keys that survived in the
heap, same way as for single case.
> TopN optimization in VectorReduceSink
> -------------------------------------
>
> Key: HIVE-5503
> URL: https://issues.apache.org/jira/browse/HIVE-5503
> Project: Hive
> Issue Type: Sub-task
> Reporter: Jitendra Nath Pandey
> Assignee: Sergey Shelukhin
> Attachments: HIVE-5503.patch
>
>
> We need to add TopN optimization to VectorReduceSink as well, it would be
> great if ReduceSink and VectorReduceSink share this code.
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