text: -- [er]retrieve starting with "||" operator
  
  create class dummy( a string);
  insert into dummy values ('adbc');
  insert into dummy values ('1111');
  insert into dummy values ('111');
  insert into dummy values ('111111111');
  insert into dummy values ('14424');
  insert into dummy values ('1412');
  insert into dummy values ('1421');
  insert into dummy values ('');
  insert into dummy values (null);
   
  select || 'hello' || 'world' from dummy order by 1;
  
   
  
  drop class dummy;