wjones127 opened a new pull request, #13338:
URL: https://github.com/apache/arrow/pull/13338

   Adds a `size` field to `WrittenFile`, so that Python users can know how many 
bytes were written. As part of this, was exposed in C++ as 
`FileWriter::GetBytesWritten()`.
   
   The reason `GetBytesWriten()` is filled in during `Finish()` is that calling 
`Tell()` on the output stream afterwards throws an error.


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