Method TestWrite

cpp/src/arrow/dataset/test_util_internal.h:1191–1196

  }

  void TestWrite() {
    auto reader = this->GetRandomData(schema({field("f64", float64())}));
    auto expected = this->MakeBufferSource(reader.get());
    auto written = this->WriteToBuffer(reader->schema());
    AssertBufferEqual(*written, *expected->buffer());
  }

  void TestCountRows() {
    auto options = std::make_shared<ScanOptions>();