Method EstimatedDataBytes

cpp/src/arrow/dataset/scanner_test.cc:196–198

    return scan_tasks_[batch_number].batch_future;
  }
  int64_t EstimatedDataBytes(int batch_number) override {
    return util::TotalBufferSize(*scan_tasks_[batch_number].batch);
  }
  int NumBatches() override { return static_cast<int>(scan_tasks_.size()); }

  // ### Unit Test API ###