[jira] [Created] (ARROW-6622) [C++][R] SubTreeFileSystem path error on Windows

["Neal Richardson (Jira)" <ji...@apache.org>]

Neal Richardson created ARROW-6622:
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             Summary: [C++][R] SubTreeFileSystem path error on Windows
                 Key: ARROW-6622
                 URL: https://issues.apache.org/jira/browse/ARROW-6622
             Project: Apache Arrow
          Issue Type: Bug
          Components: C++, R
            Reporter: Neal Richardson
             Fix For: 1.0.0


On ARROW-6438, we got this error on Windows testing out the subtree:

{code}
> test_check("arrow")
  -- 1. Error: SubTreeFilesystem (@test-filesystem.R#86)  ------------------------
  Unknown error: Underlying filesystem returned path 'C:/Users/appveyor/AppData/Local/Temp/1/RtmpqWFbxi/working_dir/Rtmp2Dfa6d/file2904934312d/DESCRIPTION', which is not a subpath of 'C:/Users/appveyor/AppData/Local/Temp/1\RtmpqWFbxi/working_dir\Rtmp2Dfa6d\file2904934312d/'
  1: st_fs$GetTargetStats(c("DESCRIPTION", "test", "nope", "DESC.txt")) at testthat/test-filesystem.R:86
  2: map(fs___FileSystem__GetTargetStats_Paths(self, x), shared_ptr, class = FileStats)
  3: fs___FileSystem__GetTargetStats_Paths(self, x)
  
  == testthat results  ===========================================================
  [ OK: 992 | SKIPPED: 2 | WARNINGS: 0 | FAILED: 1 ]
{code}

Notice the mixture of forward slashes and backslashes in the paths so that they don't match up. 

I'm not sure which layer is doing the wrong thing.



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