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Benjamin KietzmanFrançois Saint-Jacques
f7d39232856
Benjamin Kietzman authored and François Saint-Jacques committed ea033e236e6
ARROW-7824: [C++][Dataset] WriteFragments to disk

First draft of writing Fragments to disk. Writing a fragment to disk requires a FileFormat (in which the batches will be written) and a destination FileSource.

FileSystemSource::Write is provided as a convenience method: it preserves partition information while minimally changing file names.

Closes #6449 from bkietz/7824-Dataset-Provide-Dataset-w

Authored-by: Benjamin Kietzman <bengilgit@gmail.com>
Signed-off-by: François Saint-Jacques <fsaintjacques@gmail.com>