Method GetMutableValue

cpp/src/arrow/array/builder_primitive.h:145–147

  value_type GetValue(int64_t index) const { return data_builder_.data()[index]; }

  value_type* GetMutableValue(int64_t index) {
    return &data_builder_.mutable_data()[index];
  }

  void Reset() override {
    data_builder_.Reset();