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https://issues.apache.org/jira/browse/HIVE-19578?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16478398#comment-16478398
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Prasanth Jayachandran commented on HIVE-19578:
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HLL p value is also changing to 10 in HIVE-18079. With that the encoding switch
threshold is only 153 but temp list's default size is 1024. So there is no
point maintaining temp list. I will probably remove temp list as it will not
help and can cut on additional branches.
> 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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