text: --+ holdcas on;
  --test length function with operators ||, +
  select length('aaa'||'bbb') from db_root;
  set system parameters 'compat_mode=mysql';
  select length(concat('aaa','bbb')) from db_root;
  set system parameters 'compat_mode=cubrid';
  select length('aaa'+'bbb') from db_root;
  commit;
  --+ holdcas off;
  