HHH-17113 Add test for issue

hibernate-core/src/test/java/org/hibernate/orm/test/inheritance/discriminator/JoinedInheritanceForceDiscriminatorTest.java

@@ -0,0 +1,207 @@
+/*
+ * Hibernate, Relational Persistence for Idiomatic Java
+ *
+ * License: GNU Lesser General Public License (LGPL), version 2.1 or later
+ * See the lgpl.txt file in the root directory or http://www.gnu.org/licenses/lgpl-2.1.html
+ */
+package org.hibernate.orm.test.inheritance.discriminator;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import org.hibernate.Hibernate;
+import org.hibernate.annotations.DiscriminatorOptions;
+
+import org.hibernate.testing.jdbc.SQLStatementInspector;
+import org.hibernate.testing.orm.junit.DomainModel;
+import org.hibernate.testing.orm.junit.Jira;
+import org.hibernate.testing.orm.junit.SessionFactory;
+import org.hibernate.testing.orm.junit.SessionFactoryScope;
+import org.junit.jupiter.api.AfterAll;
+import org.junit.jupiter.api.BeforeAll;
+import org.junit.jupiter.api.Test;
+
+import jakarta.persistence.DiscriminatorColumn;
+import jakarta.persistence.DiscriminatorValue;
+import jakarta.persistence.Entity;
+import jakarta.persistence.FetchType;
+import jakarta.persistence.Id;
+import jakarta.persistence.Inheritance;
+import jakarta.persistence.InheritanceType;
+import jakarta.persistence.JoinColumn;
+import jakarta.persistence.OneToMany;
+import jakarta.persistence.Table;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+/**
+ * @author Andrea Boriero
+ * @author Marco Belladelli
+ */
+@DomainModel( annotatedClasses = {
+		JoinedInheritanceForceDiscriminatorTest.CommonBase.class,
+		JoinedInheritanceForceDiscriminatorTest.ElementEntity.class,
+		JoinedInheritanceForceDiscriminatorTest.AnotherEntity.class,
+		JoinedInheritanceForceDiscriminatorTest.ElementGroup.class
+} )
+@SessionFactory( useCollectingStatementInspector = true )
+@Jira( "https://hibernate.atlassian.net/browse/HHH-17113" )
+public class JoinedInheritanceForceDiscriminatorTest {
+	@BeforeAll
+	public void setUp(SessionFactoryScope scope) {
+		scope.inTransaction( session -> {
+			final ElementEntity element = new ElementEntity( 1L, "element_1" );
+			session.persist( element );
+			final AnotherEntity another = new AnotherEntity( 2L, "another_2" );
+			session.persist( another );
+			final ElementGroup elementGroup = new ElementGroup( 3L );
+			elementGroup.addElement( element );
+			session.persist( elementGroup );
+		} );
+		scope.inTransaction( session -> {
+			// Emulate association with AnotherEntity on the same element_table
+			session.createNativeMutationQuery( "update element_table set group_id = 3 where id = 2" ).executeUpdate();
+		} );
+	}
+
+	@AfterAll
+	public void tearDown(SessionFactoryScope scope) {
+		scope.inTransaction( session -> {
+			session.createMutationQuery( "delete from CommonBase" ).executeUpdate();
+			session.createMutationQuery( "delete from ElementGroup" ).executeUpdate();
+		} );
+	}
+
+	@Test
+	public void testFindAndLoad(SessionFactoryScope scope) {
+		final SQLStatementInspector inspector = scope.getCollectingStatementInspector();
+		scope.inTransaction( session -> {
+			final ElementGroup group = session.find( ElementGroup.class, 3L );
+			inspector.clear();
+			final List<ElementEntity> elements = group.getElements();
+			assertThat( Hibernate.isInitialized( elements ) ).isFalse();
+			assertThat( elements ).hasSize( 1 );
+			inspector.assertNumberOfOccurrenceInQueryNoSpace( 0, "disc_col", 1 );
+			final CommonBase commonBase = elements.get( 0 );
+			assertThat( commonBase.getId() ).isEqualTo( 1L );
+			assertThat( commonBase.getName() ).isEqualTo( "element_1" );
+		} );
+	}
+
+	@Test
+	public void testQueryAndLoad(SessionFactoryScope scope) {
+		final SQLStatementInspector inspector = scope.getCollectingStatementInspector();
+		scope.inTransaction( session -> {
+			final ElementGroup group = session.createQuery(
+					"from ElementGroup",
+					ElementGroup.class
+			).getSingleResult();
+			inspector.clear();
+			final List<ElementEntity> elements = group.getElements();
+			assertThat( Hibernate.isInitialized( elements ) ).isFalse();
+			assertThat( elements ).hasSize( 1 );
+			inspector.assertNumberOfOccurrenceInQueryNoSpace( 0, "disc_col", 1 );
+			final CommonBase commonBase = elements.get( 0 );
+			assertThat( commonBase.getId() ).isEqualTo( 1L );
+			assertThat( commonBase.getName() ).isEqualTo( "element_1" );
+		} );
+	}
+
+	@Test
+	public void testQueryAndJoinFetch(SessionFactoryScope scope) {
+		final SQLStatementInspector inspector = scope.getCollectingStatementInspector();
+		scope.inTransaction( session -> {
+			final ElementGroup group = session.createQuery(
+					"from ElementGroup g join fetch g.elements",
+					ElementGroup.class
+			).getSingleResult();
+			inspector.assertNumberOfOccurrenceInQueryNoSpace( 0, "disc_col", 1 );
+			final List<ElementEntity> elements = group.getElements();
+			assertThat( Hibernate.isInitialized( elements ) ).isTrue();
+			assertThat( elements ).hasSize( 1 );
+			final CommonBase commonBase = elements.get( 0 );
+			assertThat( commonBase.getId() ).isEqualTo( 1L );
+			assertThat( commonBase.getName() ).isEqualTo( "element_1" );
+		} );
+	}
+
+	@Inheritance( strategy = InheritanceType.JOINED )
+	@DiscriminatorColumn( name = "disc_col" )
+	@DiscriminatorOptions( force = true )
+	@Entity( name = "CommonBase" )
+	public static class CommonBase {
+		@Id
+		protected Long id;
+
+		protected String name;
+
+		public CommonBase() {
+		}
+
+		public CommonBase(Long id, String name) {
+			this.id = id;
+			this.name = name;
+		}
+
+		public Long getId() {
+			return id;
+		}
+
+		public String getName() {
+			return name;
+		}
+	}
+
+	@Entity( name = "ElementEntity" )
+	@DiscriminatorValue( "element" )
+	@Table( name = "element_table" )
+	public static class ElementEntity extends CommonBase {
+		public ElementEntity() {
+		}
+
+		public ElementEntity(Long id, String name) {
+			super( id, name );
+		}
+	}
+
+	@Entity( name = "AnotherEntity" )
+	@DiscriminatorValue( "another" )
+	@Table( name = "element_table" )
+	public static class AnotherEntity extends CommonBase {
+		public AnotherEntity() {
+		}
+
+		public AnotherEntity(Long id, String name) {
+			super( id, name );
+		}
+	}
+
+	@Entity( name = "ElementGroup" )
+	public static class ElementGroup {
+		@Id
+		protected Long id;
+
+		@OneToMany( fetch = FetchType.LAZY )
+		@JoinColumn( name = "group_id" )
+		private List<ElementEntity> elements = new ArrayList<>();
+
+		public ElementGroup() {
+		}
+
+		public ElementGroup(Long id) {
+			this.id = id;
+		}
+
+		public Long getId() {
+			return id;
+		}
+
+		public List<ElementEntity> getElements() {
+			return elements;
+		}
+
+		public void addElement(ElementEntity element) {
+			elements.add( element );
+		}
+	}
+}