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https://issues.apache.org/jira/browse/HIVE-16523?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15982241#comment-15982241
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Sergey Shelukhin edited comment on HIVE-16523 at 4/25/17 1:25 AM:
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[~gopalv] [~mmccline] do you mind taking a look?
With this patch, I see the collisions in Q58 reduced to 1-2 elements per hash
code (from 400-1200 for the worst codes before).
was (Author: sershe):
[~gopalv] [~mmccline] do you mind taking a look?
> VectorHashKeyWrapper hash code for strings is not so good
> ---------------------------------------------------------
>
> Key: HIVE-16523
> URL: https://issues.apache.org/jira/browse/HIVE-16523
> Project: Hive
> Issue Type: Bug
> Reporter: Sergey Shelukhin
> Assignee: Sergey Shelukhin
> Attachments: HIVE-16523.patch
>
>
> Perf issues in vectorized gby on some string keys
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