Hibernate version: 3.2.6.ga

I have a Criteria query with the following code:
...
Logger.info(this, " dirty session? " + this.getSession().isDirty());
List<BasePersistent> objs = criteria.list();
Logger.info(this, " dirty session? " + this.getSession().isDirty());
...

The output for this piece of code is:
false
true

So criteria.list() is causing my object to be dirtied and when the session is committed the object's version is incremented. I am pretty sure that querying for an object should not be considered to be a modification to the objects in the result set. Any ideas?

Thanks,

Update:
Doh! equals/hashcode weren't implemented properly

executing query may result in flushing session -> so all dirty objects will be persist/update to db