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https://issues.apache.org/jira/browse/HIVE-7616?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14086802#comment-14086802
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Sergey Shelukhin commented on HIVE-7616:
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it would be nice to have key count estimate in stats too, but I guess key could
be different for each query as far as Hive is concerned. Maybe we can add some
notion of keys for typical dimension tables and have stats for that.
> pre-size mapjoin hashtable based on statistics
> ----------------------------------------------
>
> Key: HIVE-7616
> URL: https://issues.apache.org/jira/browse/HIVE-7616
> Project: Hive
> Issue Type: Improvement
> Reporter: Sergey Shelukhin
> Assignee: Sergey Shelukhin
> Attachments: HIVE-7616.patch
>
>
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