HHH-19908 Add test for issue

Author: mbellade

hibernate-core/src/test/java/org/hibernate/orm/test/query/hql/thisalias/HQLThisTest.java

@@ -25,6 +25,10 @@ void test(SessionFactoryScope scope) {
 			s.createSelectionQuery("select this.name from This order by this.name").getSingleResult();
 			s.createSelectionQuery("select count(this) from This").getSingleResult();
 			s.createSelectionQuery("select id(this) from This").getSingleResult();
+			// testing case insensitivity
+			s.createSelectionQuery("select THIS.name from This ORDER BY THIS.name").getSingleResult();
+			s.createSelectionQuery("select count(THIS) from This").getSingleResult();
+			s.createSelectionQuery("select id(ThIs) from This").getSingleResult();
 		});
 	}
 	@Entity(name="This")