@dispatch(ScalarSelect)
def get_inner_columns(sel):
    inner_columns = list(sel.inner_columns)
    assert len(inner_columns) == 1, 'ScalarSelect should have only ONE column'
    return list(map(lower_column, inner_columns))
dataset/ETHPy150Open blaze/blaze/blaze/compute/sql.py/get_inner_columns/original