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https://issues.apache.org/jira/browse/HIVE-6429?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13904502#comment-13904502
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Sergey Shelukhin commented on HIVE-6429:
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all tez tests passed with HIVE-6037 backed out
> MapJoinKey has large memory overhead in typical cases
> -----------------------------------------------------
>
> Key: HIVE-6429
> URL: https://issues.apache.org/jira/browse/HIVE-6429
> Project: Hive
> Issue Type: Improvement
> Reporter: Sergey Shelukhin
> Assignee: Sergey Shelukhin
> Attachments: HIVE-6429.01.patch, HIVE-6429.WIP.patch, HIVE-6429.patch
>
>
> The only thing that MJK really needs it hashCode and equals (well, and
> construction), so there's no need to have array of writables in there.
> Assuming all the keys for a table have the same structure, for the common
> case where keys are primitive types, we can store something like a byte array
> combination of keys to reduce the memory usage. Will probably speed up
> compares too.
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