Github user rhtyd commented on the pull request:

    https://github.com/apache/cloudstack/pull/1551#issuecomment-220091668
  
    @swill I got a report that the GenericDaoBase generate query with multiple 
filters (order by clauses) may fail for MySQL:
    
    SELECT role_permissions.id, role_permissions.uuid, 
role_permissions.role_id, role_permissions.rule, role_permissions.permission, 
role_permissions.description, role_permissions.sort_order FROM role_permissions 
 ORDER BY role_permissions.sort_order ASC role_permissions.id ASC;
    ERROR 1064 (42000): You have an error in your SQL syntax; check the manual 
that corresponds to your MySQL server version for the right syntax to use near 
'role_permissions.id ASC' at line 1
    
    This was reported for mysql-community-server-5.6.23-3.el7.x86_64, though I 
was unable to reproduce the issue with either MySQL 5.6 or 5.7 (Travis uses 
5.5, and on 5.5 too we don't see any issues).
    
    Nevertheless, the `ORDER BY id` is not needed for the functionality; in the 
method we need ORDER BY sort_order i.e return list of role permission by the 
order set by the root admin.
    
    Will, I don't see this as a problem but as this is not necessary therefore 
can be safely removed.



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