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Posted to dev@hive.apache.org by "Prasanth J (JIRA)" <ji...@apache.org> on 2014/09/18 02:01:59 UTC
[jira] [Assigned] (HIVE-8078) ORC Delta encoding corrupts data when
delta overflows long
[ https://issues.apache.org/jira/browse/HIVE-8078?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Prasanth J reassigned HIVE-8078:
--------------------------------
Assignee: Prasanth J
> 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: 0.14.0, 0.13.1
> Reporter: Tim Patterson
> Assignee: Prasanth J
> Priority: Critical
> Attachments: HIVE-8078-testcase.patch, HIVE-8078.1.patch, HIVE-8078.2.patch
>
>
> 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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