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https://issues.apache.org/jira/browse/HIVE-7616?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14087104#comment-14087104
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Sergey Shelukhin commented on HIVE-7616:
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another consideration is that we currently store full hash to avoid
recalculating the missing bits when we expand. If stats can be trusted, we can
say we will never expand (if we allocate enough above the number of rows) and
avoid 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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