Method Visit

cpp/src/arrow/array/array_base.cc:65–68

  using ScalarType = typename TypeTraits<T>::ScalarType;

  Status Visit(const NullArray& a) {
    out_ = std::make_shared<NullScalar>();
    return Status::OK();
  }

  Status Visit(const BooleanArray& a) { return Finish(a.Value(index_)); }