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https://issues.apache.org/jira/browse/ARROW-6531?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16928684#comment-16928684
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Antoine Pitrou commented on ARROW-6531:
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Turns out Detach methods were already implemented on the C++ side, just need
some Python wrapper.
> [Python] Add detach() method to buffered streams
> ------------------------------------------------
>
> Key: ARROW-6531
> URL: https://issues.apache.org/jira/browse/ARROW-6531
> Project: Apache Arrow
> Issue Type: Improvement
> Components: Python
> Reporter: Wes McKinney
> Assignee: Antoine Pitrou
> 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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