

@dispatch(Slice, (Select, Selectable, ColumnElement))
def compute_up(expr, data, **kwargs):
    index = expr.index[0]
    if isinstance(index, slice):
        start = (index.start or 0)
        if (start < 0):
            raise ValueError('start value of slice cannot be negative with a SQL backend')
        stop = index.stop
        if ((stop is not None) and (stop < 0)):
            raise ValueError('stop value of slice cannot be negative with a SQL backend.')
        if ((index.step is not None) and (index.step != 1)):
            raise ValueError('step parameter in slice objects not supported with SQL backend')
    elif isinstance(index, (np.integer, numbers.Integral)):
        if (expr < 0):
            raise ValueError('integer slice cannot be negative for the SQL backend')
        start = index
        stop = (start + 1)
    else:
        raise TypeError(('type %r not supported for slicing wih SQL backend' % type(index).__name__))
    warnings.warn('The order of the result set from a Slice expression computed against the SQL backend is not deterministic.')
    if (stop is None):
        return select(data).offset(start)
    else:
        return select(data).offset(start).limit((stop - start))

dataset/ETHPy150Open blaze/blaze/blaze/compute/sql.py compute_up/VarMisuse@155/232 `index`->`expr`