Method Summarize

cpp/src/arrow/type.cc:1681–1693

  template <typename OStream, typename U = T>
  std::enable_if_t<std::is_same_v<U, Field>> Summarize(OStream* os) const {
    const FieldVector* fields = get_children();
    if (!fields && get_parent()) {
      fields = &get_parent()->type()->fields();
    }
    *os << "fields: { ";
    if (fields) {
      for (const auto& field : *fields) {
        *os << field->ToString() << ", ";
      }
    }
    *os << "}";
  }

  template <typename OStream, typename U = T>
  std::enable_if_t<!std::is_same_v<U, Field>> Summarize(OStream* os) const {