Commits
Antoine Pitrou authored and Korn, Uwe committed 54df19db82e
ARROW-1018: [C++] Create FileOutputStream, ReadableFile from file descriptor Also: - move platform-specific code to `util/file-util.h` - backport the `FileReadAt` helper from PR #1867 (to minimize conflicts) - add a pipe-writing benchmark for more realistic numbers Author: Antoine Pitrou <antoine@python.org> Closes #1909 from pitrou/ARROW-1018-open-fd and squashes the following commits: 0153b150 <Antoine Pitrou> Add pipe-writing benchmark 57ea1657 <Antoine Pitrou> ARROW-1018: Allow creating file objects from a file descriptor