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Sutou Kouhei authored and GitHub committed 8d8d21ff9bd
GH-15256: [C++][Dataset] Add support for writing with Partitioning::Default() (#33674) ### What changes are included in this PR? It writes all data into one directory. ### Are these changes tested? Yes. ### Are there any user-facing changes? Yes. * Closes: #15256 Authored-by: Sutou Kouhei <kou@clear-code.com> Signed-off-by: Weston Pace <weston.pace@gmail.com>