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https://issues.apache.org/jira/browse/HIVE-12664?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15067081#comment-15067081
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Ashutosh Chauhan commented on HIVE-12664:
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Also you may create a RB entry on https://reviews.apache.org/r/new/ to ease
review.
> Bug in reduce deduplication optimization causing ArrayOutOfBoundException
> -------------------------------------------------------------------------
>
> Key: HIVE-12664
> URL: https://issues.apache.org/jira/browse/HIVE-12664
> Project: Hive
> Issue Type: Bug
> Components: Hive
> Affects Versions: 1.1.1, 1.2.1
> Reporter: Johan Gustavsson
> Assignee: Johan Gustavsson
> Attachments: HIVE-12664-1.patch, HIVE-12664.patch
>
>
> The optimisation check for reduce deduplication only checks the first child
> node for join -and the check itself also contains a major bug- causing
> ArrayOutOfBoundException no matter what.
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