@dispatch(Head, (box(bcolz.ctable), box(bcolz.carray)))
def compute_down(expr, data, **kwargs):
    leaf = expr._leaves()[0]
    if all(isinstance(e, Cheap) for e in path(expr, leaf)):
        val = data.value
        return compute(
            expr,
            {leaf: into(Iterator, val)},
            return_type='native',
            **kwargs
        )
    else:
        raise MDNotImplementedError()
Test that it exposes the Archive Core Type as type
dataset/ETHPy150Open blaze/blaze/blaze/compute/bcolz.py/compute_down--crossover with--dataset/ETHPy150Open BelgianBiodiversityPlatform/python-dwca-reader/dwca/test/test_descriptors.py/TestDataFileDescriptor.test_exposes_core_type