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Posted to dev@arrow.apache.org by "Wes McKinney (JIRA)" <ji...@apache.org> on 2019/08/02 20:08:00 UTC

[jira] [Created] (ARROW-6126) [C++] IPC stream reader handling of empty streams potentially not robust

Wes McKinney created ARROW-6126:
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             Summary: [C++] IPC stream reader handling of empty streams potentially not robust
                 Key: ARROW-6126
                 URL: https://issues.apache.org/jira/browse/ARROW-6126
             Project: Apache Arrow
          Issue Type: Bug
          Components: C++
            Reporter: Wes McKinney
             Fix For: 0.15.0


If dictionaries are expected in a stream, but the stream terminates, then "empty stream" logic is triggered to suppress errors, see

https://github.com/apache/arrow/blob/master/cpp/src/arrow/ipc/reader.cc#L482

It's probably esoteric but this "empty stream" logic will trigger if the stream terminates in the middle of the dictionary messages, which is a legitimate error. So we should only bail out early (concluding that we have an empty stream) if the first dictionary message is null



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