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https://issues.apache.org/jira/browse/HIVE-7616?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14087106#comment-14087106
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Sergey Shelukhin commented on HIVE-7616:
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also, for joins where many rows come from right side per key, this patch will
not be so good (hashtable will be too big), given the above about number of
keys vs number of rows
> 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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