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https://issues.apache.org/jira/browse/HIVE-6641?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13938615#comment-13938615
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Sergey Shelukhin commented on HIVE-6641:
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pretty sure...
> optimized HashMap keys won't work correctly with decimals
> ---------------------------------------------------------
>
> Key: HIVE-6641
> URL: https://issues.apache.org/jira/browse/HIVE-6641
> Project: Hive
> Issue Type: Bug
> Reporter: Sergey Shelukhin
> Assignee: Sergey Shelukhin
> Attachments: HIVE-6641.patch
>
>
> Decimal values with can be equal while having different byte representations
> (different precision/scale), so comparing bytes is not enough. For a quick
> fix, we can disable this for decimals
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