Wrong SQL generated for HQL subquery referencing a superclass property in joined inheritance schema in Hibernate

Issue

• An entity (e.g. Employee) extends a superclass (Person) in an InheritanceType.JOINED hierarchy

• A superclass property (e.g. Person.firstName) is referenced in an HQL subquery involving the subclass

  ... where exists (select employee from company.employees as employee where lower(employee.firstName) like :param1 ...
  

• The generated SQL references a non-existent join (the subclass/superclass table join is missing but referenced)

  ... where exists (select employees1_.id from Employee employees1_ where ... lower(employees1_1_.firstName) ...