Method WriteValidityField

cpp/src/arrow/integration/json_internal.cc:726–739

  }

  void WriteValidityField(const Array& arr) {
    writer_->Key("VALIDITY");
    writer_->StartArray();
    if (arr.null_count() > 0) {
      for (int i = 0; i < arr.length(); ++i) {
        writer_->Int(arr.IsNull(i) ? 0 : 1);
      }
    } else {
      for (int i = 0; i < arr.length(); ++i) {
        writer_->Int(1);
      }
    }
    writer_->EndArray();
  }

  void SetNoChildren() {
    // Nothing.  We used to write an empty "children" array member,