Get children count via HQL

I have a one-to-many mapping between a parent entity and child entities. Now I need to find the number of children associated with each parent for a list of parents. I am trying to do this with HQL but I am not sure how I can get the list of parents in there. Also, I don't know how I can return the entity itself and not just its ID. My current HQL query is: ``` select new map(parent.id as parentId, count(*) as childCount) from Parent parent left join parent.children children group by parent.id ``` but this only returns the ID and does not filter on specific parents. EDIT Based on Pascal's answer I have modified the query to ``` select new map(parent as parent, count(elements(parent.children)) as childCount) from Parent parent group by parent ``` That does work, but is prohibitively slow: 30 seconds instead of 400 ms on the same database.