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Antoine Pitrou authored and Wes McKinney committed 17124106323
ARROW-8429: [C++] Implement missing checks in IPC MessageDecoder Also allow taking 0-sized slices in Buffer::CopySlice. Closes #6917 from pitrou/ARROW-8429-ipc-decoder-checks Authored-by: Antoine Pitrou <antoine@python.org> Signed-off-by: Wes McKinney <wesm+git@apache.org>