Method GetFragmentsImpl

cpp/src/arrow/dataset/scanner_test.cc:1759–1763

 protected:
  Result<FragmentIterator> GetFragmentsImpl(compute::Expression predicate) override {
    std::vector<std::shared_ptr<Fragment>> casted_fragments(fragments_.begin(),
                                                            fragments_.end());
    return MakeVectorIterator(std::move(casted_fragments));
  }

 private:
  std::vector<std::shared_ptr<ControlledFragment>> fragments_;