[jira] [Created] (ARROW-13161) Allow setting FragmentReadahead to 0 in ScannerBuilder

["Jayjeet Chakraborty (Jira)" <ji...@apache.org>]

Jayjeet Chakraborty created ARROW-13161:
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             Summary: Allow setting FragmentReadahead to 0 in ScannerBuilder
                 Key: ARROW-13161
                 URL: https://issues.apache.org/jira/browse/ARROW-13161
             Project: Apache Arrow
          Issue Type: Improvement
          Components: C++
            Reporter: Jayjeet Chakraborty


I have an application where I need to set fragment readahead to 0. But, looks like for some reason the ScannerBuilder does not allow setting the fragment readahead to 0 [1]. It would be very helpful to know why it is that way and if a PR lifting that restriction would be accepted because a docstring mentions that users can set fragment readahead to 0 if they want [2].

[1]https://github.com/apache/arrow/blob/master/cpp/src/arrow/dataset/scanner.cc#L864
[2]https://github.com/apache/arrow/blob/998a2a1668ea57a49d85fbb38f7f0e7eb94c29db/cpp/src/arrow/dataset/scanner.h#L93



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