Method field

cpp/src/arrow/scalar.cc:721–734

}

Result<std::shared_ptr<Scalar>> StructScalar::field(FieldRef ref) const {
  ARROW_ASSIGN_OR_RAISE(auto path, ref.FindOne(*type));
  if (path.indices().size() != 1) {
    return Status::NotImplemented("retrieval of nested fields from StructScalar");
  }
  auto index = path.indices()[0];
  if (is_valid) {
    return value[index];
  } else {
    const auto& struct_type = checked_cast<const StructType&>(*this->type);
    const auto& field_type = struct_type.field(index)->type();
    return MakeNullScalar(field_type);
  }
}

RunEndEncodedScalar::RunEndEncodedScalar(std::shared_ptr<Scalar> value,
                                         std::shared_ptr<DataType> type)