Hi. This still is the case with Hibernate 5.2.10 on Oracle. It appears that simple a group by (only stating columns) is not a problem. The issue arises when an entity is part of the select clause. In that case Hibernate does not explodes the column names in the group (or only the id) resulting in errors on most databases. As having a working group seems rather basic (imho), could this be set to urgent please. Thanks!