sunchao commented on pull request #6949:
URL: https://github.com/apache/arrow/pull/6949#issuecomment-619140531


   >  It's the reader (file handle) that is passed to it that should be thread 
safe
   
   Is [file](https://doc.rust-lang.org/std/fs/struct.File.html) thread-safe? 
it's not obvious when reading the doc. Plus, here type parameter`R` can be 
anything that implements `ParquetReader` (with read, seek, length and try_clone 
capabilities) so you cannot assume all of them guarantees thread-safety.


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