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https://issues.apache.org/jira/browse/ARROW-13161?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17368817#comment-17368817
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David Li commented on ARROW-13161:
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[~westonpace] can confirm but it's because places of the code use it as the
number of files to read, total, i.e. readahead == 0 would read _no_ fragments.
So that docstring is a little misleading.
However: what is your use case, so we can better understand it/why does
fragment_readahead = 1 not suffice?
> 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
> Priority: Major
>
> 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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