Function NumPyFrequency

python/pyarrow/src/arrow/python/type_traits.h:302–315

};

static inline NPY_DATETIMEUNIT NumPyFrequency(TimeUnit::type unit) {
  switch (unit) {
    case TimestampType::Unit::SECOND:
      return NPY_FR_s;
    case TimestampType::Unit::MILLI:
      return NPY_FR_ms;
      break;
    case TimestampType::Unit::MICRO:
      return NPY_FR_us;
    default:
      // NANO
      return NPY_FR_ns;
  }
}

static inline int NumPyTypeSize(int npy_type) {
  npy_type = fix_numpy_type_num(npy_type);