Function Make

cpp/src/arrow/type.h:1451–1459

  static constexpr int kInvalidChildId = -1;

  static Result<std::shared_ptr<DataType>> Make(
      const FieldVector& fields, const std::vector<int8_t>& type_codes,
      UnionMode::type mode = UnionMode::SPARSE) {
    if (mode == UnionMode::SPARSE) {
      return sparse_union(fields, type_codes);
    } else {
      return dense_union(fields, type_codes);
    }
  }

  DataTypeLayout layout() const override;