def is_null(self, value=True):
        return QNode(**{'{}__isnull'.format(self.get_path()): value})
Return a sparse N-dim array of zeros.
dataset/ETHPy150Open Nepherhotep/django-orm-sugar/django_orm_sugar.py/QFactory.is_null--crossover with--dataset/ETHPy150Open sympy/sympy/sympy/tensor/array/sparse_ndim_array.py/SparseNDimArray.zeros