marberts commented on PR #49343:
URL: https://github.com/apache/arrow/pull/49343#issuecomment-3953666388

   Awesome, thanks!
   
   For your question, it seems like `write_dataset()` behaves differently on 
windows and ubuntu. In some cases row-order is kept on windows when 
`preserve_order = FALSE` (but not always). We can see this from the CI job when 
I had the test `expect_false(all(unordered_ds$x == df$x))`: it passed on ubuntu 
and windows with an older version of R, but failed on windows with a newer 
version of R 
(https://github.com/apache/arrow/actions/runs/22290480076/job/64535896168). I 
could reproduce this on my machine with R 4.5.2, with both ubuntu and windows.


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