Using the following query with the paginator fails:
FROM User u
JOIN Message m WITH m.author = u
WHERE m.status = 'draft' -- a condition justifying the join
The CountWalker and the CountOutputWalker both throw a exception saying "Cannot count query which selects two FROM components, cannot make distinction"
This message is wrong (I can make distinction here. Only User is selected in the result set) and confusing (I spent some time finding the second FROM before figuring it was related to the use of an arbitrary join instead of an association join).