Function dense_union

cpp/src/arrow/type.cc:3279–3285

                                           std::move(type_codes));
}
std::shared_ptr<DataType> dense_union(FieldVector child_fields,
                                      std::vector<int8_t> type_codes) {
  if (type_codes.empty()) {
    type_codes = internal::Iota<int8_t>(0, child_fields.size());
  }
  return std::make_shared<DenseUnionType>(std::move(child_fields), std::move(type_codes));
}

namespace {