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https://issues.apache.org/jira/browse/ORC-703?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Panagiotis Garefalakis reassigned ORC-703:
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Assignee: Panagiotis Garefalakis
> RLE encoding bug on large negative integer
> ------------------------------------------
>
> Key: ORC-703
> URL: https://issues.apache.org/jira/browse/ORC-703
> Project: ORC
> Issue Type: Bug
> Reporter: lichaoyong
> Assignee: Panagiotis Garefalakis
> Priority: Major
>
> ORC has use RLE to encoding/decoding integer.
> Four types are comprised of the RLE encoding/decoding algorithm.
> Short Repeat : used for short repeating integer sequences.
> Direct : used for integer sequences whose values have a relatively constant
> bit width.
> Patched Base : used for integer sequences whose bit widths varies a lot.
> Delta : used for monotonically increasing or decreasing sequences.
> This bug occurs in Patched Base Type for large negative number.
> In patched base, base value is stored 1 to 8 bytes and encoding to 0 ~ 7.
> If the base value is 8 byte, the encoding value for base width should be 7.
> But now will encoding to 8, this is problem.
> It will result in inconsistent data with loaded data because wrong encoding
> procedure.
> In extreme case, the process will be cored dump because illegal address.
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