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from d2ddaa6 ARROW-1692: [Java] UnionArray round trip not working add 18a5e3e ARROW-9331: [C++] Improve the performance of Tensor-to-SparseTensor conversion No new revisions were added by this update. Summary of changes: cpp/src/arrow/tensor/converter_internal.h | 88 +++++++++++++++++++ cpp/src/arrow/tensor/coo_converter.cc | 140 +++++++++++++++++++++++++----- cpp/src/arrow/tensor/csx_converter.cc | 2 +- cpp/src/arrow/util/macros.h | 1 + 4 files changed, 208 insertions(+), 23 deletions(-) create mode 100644 cpp/src/arrow/tensor/converter_internal.h