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Antoine Pitrou authored and Wes McKinney committed 16989513aca
ARROW-9106: [Python] Allow specifying CSV file encoding Also add a C++ InputStream wrapper that transforms data from the stream according to an arbitrary callable. Closes #7456 from pitrou/ARROW-9106-csv-transcoding Authored-by: Antoine Pitrou <antoine@python.org> Signed-off-by: Wes McKinney <wesm@apache.org>