Method Allocate

python/pyarrow/src/arrow/python/arrow_to_pandas.cc:1601–1605

 protected:
  Status Allocate() override {
    RETURN_NOT_OK(this->AllocateNDArray(NPY_DATETIME));
    SetDatetimeUnit(internal::NumPyFrequency(UNIT));
    return Status::OK();
  }
};

using DatetimeSecondWriter = DatetimeWriter<TimeUnit::SECOND>;