Method toString

bolt/vector/ConstantVector.h:366–376

      }
    }

    return SimpleVector<T>::compare(other, index, otherIndex, flags);
  }

  std::string toString() const {
    if (valueVector_) {
      return valueVector_->toString(index_);
    }

    if (isNull_) {
      return "null";
    } else {
      return SimpleVector<T>::valueToString(value());
    }