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If an entity class has both a super and a child class then while running a query we see the error "Invalid query key in expression"
In the fix we have tried to set the builder of such expression/subclasses appropriately
The test case is also added at jpa/eclipselink.jpa.testapps/jpa.test.advanced2/src/test/java/org/eclipse/persistence/testing/tests/advanced2/jpql/JPQLTest.java