Function DurationScalar

cpp/src/arrow/scalar.h:526–528

  using TemporalScalar<DurationType>::TemporalScalar;

  DurationScalar(typename TemporalScalar<DurationType>::ValueType value,
                 TimeUnit::type unit)
      : DurationScalar(std::move(value), duration(unit)) {}

  // Convenience constructors for a DurationScalar from std::chrono::nanoseconds
  template <template <typename, typename> class StdDuration, typename Rep>