text: --+ holdcas on;
  -- operate '14:24:00 05/26/2008' with "+" and "-" operator
  
  
  create class dummy( a int );
  insert into dummy values (1);
  
  
  select '14:24:00 05/26/2008' + 1 - 1 - '14:24:00 05/26/2008' + 10 from dummy ;
  
  drop class dummy;
  
  set system parameters 'compat_mode=mysql';
  
  create class dummy( a int );
  insert into dummy values (1);
  
  
  select '14:24:00 05/26/2008' + 1 - 1 - '14:24:00 05/26/2008' + 10 from dummy ;
  
  drop class dummy;
  
  set system parameters 'compat_mode=cubrid';
  commit;
  --+ holdcas off;
  