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Posted to issues@impala.apache.org by "Tim Armstrong (JIRA)" <ji...@apache.org> on 2017/10/11 01:03:00 UTC

[jira] [Created] (IMPALA-6039) BitReader::GetAligned() doesn't zero out trailing bytes

Tim Armstrong created IMPALA-6039:
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             Summary: BitReader::GetAligned() doesn't zero out trailing bytes
                 Key: IMPALA-6039
                 URL: https://issues.apache.org/jira/browse/IMPALA-6039
             Project: IMPALA
          Issue Type: Bug
          Components: Backend
    Affects Versions: Impala 2.11.0
            Reporter: Tim Armstrong
            Assignee: Tim Armstrong
            Priority: Minor


BitReader::GetAligned() only sets the initial bytes of the output value, leaving the remaining bytes set to whatever they were previously. It isn't clear if this is intentional and undocumented or a latent bug.

The problem is non-obvious because the current callsites either call it with a single byte at a time (GetVlqInt()), or initialize the output value to zero and always call GetAligned() with the same num_bytes value (RleDecoder).



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