HQL distinct set

I have an entity that contains a set of other entities.

class Foo {
    ....
    private Set<Bar> bars = new HashSet<Bar>();
    ....
}

class Bar {开发者_Python百科
    private long id;
    private String name;
    ....
}

Is it possible to do a HQL distinct query to get a list of all the unique Sets?

select distinct f.bars from Foo f 

only returns the distict list of all Foo's

Try:

select distinct elements(f.bars) from Foo f