Method ReadNext

cpp/src/arrow/dataset/scanner.cc:104–112

  std::shared_ptr<Schema> schema() const override { return schema_; }
  Status ReadNext(std::shared_ptr<RecordBatch>* batch) override {
    ARROW_ASSIGN_OR_RAISE(auto next, delegate_.Next());
    if (IsIterationEnd(next)) {
      *batch = nullptr;
    } else {
      *batch = std::move(next.record_batch);
    }
    return Status::OK();
  }

  Status Close() override {
    std::shared_ptr<RecordBatch> batch;