test for JPQL 'this' implicit identification variable

Signed-off-by: Gavin King <gavin@hibernate.org>

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

@@ -0,0 +1,36 @@
+package org.hibernate.orm.test.query.hql.thisalias;
+
+import jakarta.persistence.Basic;
+import jakarta.persistence.Entity;
+import jakarta.persistence.GeneratedValue;
+import jakarta.persistence.Id;
+import org.hibernate.testing.orm.junit.DomainModel;
+import org.hibernate.testing.orm.junit.SessionFactory;
+import org.hibernate.testing.orm.junit.SessionFactoryScope;
+import org.junit.jupiter.api.Test;
+
+@SessionFactory
+@DomainModel(annotatedClasses = HQLThisTest.This.class)
+public class HQLThisTest {
+	@Test
+	void test(SessionFactoryScope scope) {
+		scope.inTransaction(s -> s.persist(new This("gavin")));
+		scope.inSession(s -> {
+			s.createSelectionQuery("select this.name from This this where this.name = 'gavin'").getSingleResult();
+			s.createSelectionQuery("from This where this.name = 'gavin'").getSingleResult();
+			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
+	static class This {
+		@Id @GeneratedValue
+		long id;
+		@Basic(optional = false)
+		String name;
+
+		This(String gavin) {}
+		This() {}
+	}
+}