Wes McKinney resolved ARROW-6527.
    Fix Version/s: 0.15.0
       Resolution: Fixed

Issue resolved by pull request 5406

> [C++] Add OutputStream::Write() variant taking an owned buffer
> --------------------------------------------------------------
>                 Key: ARROW-6527
>                 URL: https://issues.apache.org/jira/browse/ARROW-6527
>             Project: Apache Arrow
>          Issue Type: Improvement
>          Components: C++
>            Reporter: Antoine Pitrou
>            Assignee: Antoine Pitrou
>            Priority: Major
>              Labels: pull-request-available
>             Fix For: 0.15.0
>          Time Spent: 1h 20m
>  Remaining Estimate: 0h
> When Write() takes an arbitrary data pointer and needs to buffer it, it is 
> mandatory to copy the data because the pointer may go stale, or the data may 
> be overwritten.
> Buf if the user has an immutable Buffer, then it should be enough to store 
> the Buffer as necessary, without doing a memory copy. We could add a special 
> Write() variant for that.

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