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Kazuaki Ishizaki authored and Sutou Kouhei committed f5b7303e474
ARROW-8757: [C++][Plasma] Write Plasma header in little-endian format This PR writes and reads Plasma header (version, type, and length) in the big-endian format. It allows us to make it easy to interpret a header of Plasma data among different endian machines. The current issue is to write Plasma header in native endian at [here](https://github.com/apache/arrow/blob/master/cpp/src/plasma/io.cc#L65-L71). It is not possible to know version, type, and length of a given Plasma file among different platforms. Feather V2 also uses little-endian for the header based on [the discussion](https://github.com/apache/arrow/pull/6777#discussion_r400770040). This PR uses little-endian by following this discussion. Closes #7146 from kiszk/ARROW-8757 Authored-by: Kazuaki Ishizaki <ishizaki@jp.ibm.com> Signed-off-by: Sutou Kouhei <kou@clear-code.com>