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https://issues.apache.org/jira/browse/HIVE-12354?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14994653#comment-14994653
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Sergey Shelukhin commented on HIVE-12354:
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[~prasanth_j] updated the patch to use the existing code
> MapJoin with double keys is slow on MR
> --------------------------------------
>
> Key: HIVE-12354
> URL: https://issues.apache.org/jira/browse/HIVE-12354
> Project: Hive
> Issue Type: Bug
> Reporter: Sergey Shelukhin
> Assignee: Sergey Shelukhin
> Attachments: HIVE-12354.01.patch, HIVE-12354.03.patch,
> HIVE-12354.patch
>
>
> Double keys are also a common type when comparing numbers with strings, and
> such, so it happens more often than one would expect. This is due to
> HADOOP-12217
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