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Antoine Pitrou authored and Benjamin Kietzman committed 83462a1b996
ARROW-590: [Integration][C++] Implement union types Implement integration tests for sparse and dense unions. Enable them for C++ (only). Closes #6948 from pitrou/ARROW-590-union-integration Authored-by: Antoine Pitrou <antoine@python.org> Signed-off-by: Benjamin Kietzman <bengilgit@gmail.com>