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Posted to issues@arrow.apache.org by "Louis Calot (Jira)" <ji...@apache.org> on 2022/08/25 13:44:00 UTC

[jira] [Created] (ARROW-17524) The ORC reader method ReadStripe does not work when we specify fields to selected as a list of integers

Louis Calot created ARROW-17524:
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             Summary: The ORC reader method ReadStripe does not work when we specify fields to selected as a list of integers
                 Key: ARROW-17524
                 URL: https://issues.apache.org/jira/browse/ARROW-17524
             Project: Apache Arrow
          Issue Type: Bug
          Components: C++
    Affects Versions: 8.0.1
            Reporter: Louis Calot


I think there is a bug in the ORC reader : when we specify the fields indexes that we want to keep, it does not work correctly. Looking at the code, it seems to be because we do "includeTypes" in lieue of "include" when setting the ORC options.
It can be problematic when we want to import an ORC table containing Union types as it will do an error at the import, even if we try not to import these specific fields.

The definitions of the corresponding ORC methods are here :
[https://github.com/apache/orc/blob/72220851cbde164a22706f8d47741fd1ad3db190/c%2B%2B/src/Options.hh#L185-L191]

and
[https://github.com/apache/orc/blob/72220851cbde164a22706f8d47741fd1ad3db190/c%2B%2B/src/Options.hh#L201-L207]



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