Function BoxValueCounts

cpp/src/arrow/compute/kernels/vector_hash.cc:632–638

}

std::shared_ptr<ArrayData> BoxValueCounts(const std::shared_ptr<ArrayData>& uniques,
                                          const std::shared_ptr<ArrayData>& counts) {
  auto data_type =
      struct_({field(kValuesFieldName, uniques->type), field(kCountsFieldName, int64())});
  ArrayVector children = {MakeArray(uniques), MakeArray(counts)};
  return std::make_shared<StructArray>(data_type, uniques->length, children)->data();
}

Status ValueCountsFinalize(KernelContext* ctx, std::vector<Datum>* out) {
  auto hash_impl = checked_cast<HashKernel*>(ctx->state());