Method ReplaceSchema

cpp/src/arrow/dataset/scanner_test.cc:1747–1750

  std::string type_name() const override { return "scanner_test.cc::ControlledDataset"; }
  Result<std::shared_ptr<Dataset>> ReplaceSchema(
      std::shared_ptr<Schema> schema) const override {
    return Status::NotImplemented("Should not be called by unit test");
  }

  void DeliverBatch(int fragment_index, int num_rows) {
    fragments_[fragment_index]->DeliverBatch(num_rows);