Incorrect usage of CUBE/ROLLUP and ORDER BY for a basic query

I am not sure if this a bug or an intended limitation.
But this is not documented and this is certainly an issue. We cannot run a lot of queries in TPC-DS because of this.

create table _t1 (a int, b int, c int);

explain 

select 

  a,b,c

from 

  _t1

group by 

  a,b,c with rollup

order by 

  a,b,c;

Gives this error:

ERROR 1221 (HY000): Incorrect usage of CUBE/ROLLUP and ORDER BY