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https://issues.apache.org/jira/browse/HIVE-19578?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16478696#comment-16478696
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Prasanth Jayachandran commented on HIVE-19578:
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Int2ByteSortedMap is in fastutil. This dependency is 18MB jar. I am not sure if
it be worth it to bring such a big dependency as this jar also has to be
bundled with hive-exec. We discussed this during the initial HLL implementation
that this 3rd party dependency is big and replaced Int2ByteSortedMap with java
TreeMap. If performance becomes a bigger concern we can consider bringing the
jar, I think for now we can stick on to TreeMap and add just the optimizations.
> HLL merges tempList on every add
> --------------------------------
>
> Key: HIVE-19578
> URL: https://issues.apache.org/jira/browse/HIVE-19578
> Project: Hive
> Issue Type: Bug
> Reporter: Sergey Shelukhin
> Assignee: Prasanth Jayachandran
> Priority: Major
> Attachments: Screen Shot 2018-05-16 at 15.29.12 .png
>
>
> See comments on HIVE-18866; this has significant perf overhead after the
> even bigger overhead from hashing is removed. !Screen Shot 2018-05-16 at
> 15.29.12 .png!
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