text: --test in with collection :set
  
  create class t1 (c1 int, c2 set varchar(20));
  insert into t1 values(101, {'a','b','c'});
  insert into t1 values(102, {'l','m','n'});
  insert into t1 values(103, {'x','y','z'});
  insert into t1 values(104, {'d','e','f'});
  
  select * from t1 where c2 in ({'a','b','c'});
  
  drop class t1;
  
  