Function MakeSpecificNullScalar

cpp/src/arrow/scalar_test.cc:1860–1865

}

std::shared_ptr<Scalar> MakeSpecificNullScalar(const DenseUnionType& type,
                                               int field_index) {
  int8_t type_code = type.type_codes()[field_index];
  auto value = MakeNullScalar(type.field(field_index)->type());
  return std::make_shared<DenseUnionScalar>(value, type_code, type.GetSharedPtr());
}

std::shared_ptr<Scalar> MakeSpecificNullScalar(const SparseUnionType& type,
                                               int field_index) {