Method DeliverBatchesInOrder

cpp/src/arrow/dataset/scanner_test.cc:294–297

  }

  void DeliverBatchesInOrder(bool slow) {
    std::ignore = DeliverInit(slow).Then(
        [this, slow] { fragment_scanner_->DeliverBatchesInOrder(slow); });
  }

  Future<> DeliverBatchesRandomly(bool slow, ConcurrentGen* gen) {
    return DeliverInit(slow).Then(