Function MakeNullScalar

cpp/src/arrow/scalar.cc:996–998

}  // namespace

std::shared_ptr<Scalar> MakeNullScalar(std::shared_ptr<DataType> type) {
  return MakeNullImpl{std::move(type), nullptr}.Finish();
}

std::string Scalar::ToString() const {
  if (!this->is_valid) {