Wes McKinney commented on ARROW-6531:

I'm thinking about the use case where this is used from Python with 
{{pa.output_stream(f, buffer_size=...)}}. As soon as the buffered stream is 
closed, {{f}} is closed unconditionally.

> [C++] Do not always close raw OutputStream in BufferedOutputStream::Close
> -------------------------------------------------------------------------
>                 Key: ARROW-6531
>                 URL: https://issues.apache.org/jira/browse/ARROW-6531
>             Project: Apache Arrow
>          Issue Type: Improvement
>          Components: C++
>            Reporter: Wes McKinney
>            Priority: Major
>             Fix For: 0.15.0
> {{BufferedOutputStream::Close}} closes the raw file handle unconditionally. 
> This may be undesirable in some circumstances.
> Some alternatives:
> * Do not close it
> * Only close it if the {{use_count}} of the {{shared_ptr}} is 1, so we know 
> that no one else has a copy of the shared_ptr

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