Method MakeScanner

cpp/src/arrow/dataset/scanner_test.cc:1887–1894

  }

  std::shared_ptr<Scanner> MakeScanner(int fragment_readahead = 0) {
    ScannerBuilder builder(dataset_);
    if (fragment_readahead != 0) {
      ARROW_EXPECT_OK(builder.FragmentReadahead(fragment_readahead));
    }
    EXPECT_OK_AND_ASSIGN(auto scanner, builder.Finish());
    return scanner;
  }

  void AssertBatchesInOrder(const std::vector<TaggedRecordBatch>& batches,
                            std::vector<int> expected_order) {