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https://issues.apache.org/jira/browse/HIVE-12945?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15120400#comment-15120400
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Gopal V commented on HIVE-12945:
--------------------------------
Had to write a small UDF to do the checks
https://github.com/t3rmin4t0r/hive-bucket-helpers/tree/master
> Bucket pruning: bucketing for -ve hashcodes have historical issues
> ------------------------------------------------------------------
>
> Key: HIVE-12945
> URL: https://issues.apache.org/jira/browse/HIVE-12945
> Project: Hive
> Issue Type: Bug
> Components: Tez
> Affects Versions: 2.0.0
> Reporter: Gopal V
> Assignee: Gopal V
> Priority: Critical
> Attachments: HIVE-12945.1.patch
>
>
> The different ETL pathways differed in reducer choice slightly for -ve
> hashcodes.
> {code}
> (hashCode & Integer.MAX_VALUE) % numberOfBuckets;
> !=
> Math.abs(hashCode) % numberOfBuckets
> {code}
> Add a backwards compat option, which can be used to protect against old data
> left over from 0.13.
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