[cassandra] sorting TimeUUID column?

[AJ Chen]

I have a column family for sorting time-uuid and expect to retrieve columns
in descending order (i.e. latest on the top). but the following get_slice
call returns column in ascending order.  Does cassandra sort time-uuid
column in descending order by default? Should get_slice call return the most
recent time-uuid?

    <ColumnFamily CompareWith="TimeUUIDType" Name="Index"/>

    ColumnParent columnParent = new ColumnParent(cf);
    SlicePredicate predicate = new SlicePredicate();
    SliceRange sliceRange = new SliceRange();
    sliceRange.setStart(new byte[] {});
    sliceRange.setFinish(new byte[] {});
    sliceRange.setCount(max);
    predicate.setSlice_range(sliceRange);
    return client.get_slice(keyspace, key, columnParent, predicate,
ConsistencyLevel.ONE);

thanks,
-aj--