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Antoine Pitrou authored and GitHub committed de3cdc00c21
GH-39962: [C++] Small CSV reader refactoring (#39963) ### What changes are included in this PR? Factor our some shared functionality in the CSV reader to avoid code duplication. ### Are these changes tested? Yes, by existing tests. ### Are there any user-facing changes? No. * Closes: #39962 Authored-by: Antoine Pitrou <antoine@python.org> Signed-off-by: Antoine Pitrou <antoine@python.org>