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Posted to dev@hive.apache.org by "Tim Patterson (JIRA)" <ji...@apache.org> on 2014/09/12 20:47:34 UTC

[jira] [Created] (HIVE-8078) ORC Delta encoding corrupts data when delta overflows long

Tim Patterson created HIVE-8078:
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             Summary: ORC Delta encoding corrupts data when delta overflows long
                 Key: HIVE-8078
                 URL: https://issues.apache.org/jira/browse/HIVE-8078
             Project: Hive
          Issue Type: Bug
          Components: File Formats
    Affects Versions: 0.13.1, 0.14.0
            Reporter: Tim Patterson
            Priority: Critical


There is an issue with the integer encoding that can cause corruption in certain cases.
The following 3 longs cause this failure.
4513343538618202711
2911390882471569739
-9181829309989854913

I believe that even though the numbers are in decreasing order, the delta between the last two numbers overflows causing a positive delta, in this case the last digit ends up being corrupted (the delta is applied for the wrong sign resulting in -3442132998776557225 instead of -9181829309989854913.




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