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https://issues.apache.org/jira/browse/HIVE-19578?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16479665#comment-16479665
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Prasanth Jayachandran commented on HIVE-19578:
----------------------------------------------
New benchmark run with and without .2 patch
{code:java}
Benchmark Mode Cnt Score Error Units
HyperLogLogAdd.testHLLAddHiveWithPatch avgt 10 7.110 ± 0.085 ns/op
HyperLogLogAdd.testHLLAddHiveWithoutPath avgt 10 46.276 ± 2.767 ns/op{code}
> 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: HIVE-19578.1.patch, HIVE-19578.2.patch, 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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