HHH-19730 Avoid bulk-delete collection cleanup when delete cascaded

hibernate-core/src/main/java/org/hibernate/query/sqm/mutation/internal/SqmMutationStrategyHelper.java

@@ -174,11 +174,8 @@ private static void visitCollectionTableDeletes(
 		final SessionFactoryImplementor sessionFactory = attributeMapping.getCollectionDescriptor().getFactory();
 		final JdbcServices jdbcServices = sessionFactory.getJdbcServices();
 
-		if ( separateCollectionTable == null ) {
-			// one-to-many - update the matching rows in the associated table setting the fk column(s) to null
-			// not yet implemented - do nothing
-		}
-		else {
+		// Skip deleting rows in collection tables if cascade delete is enabled
+		if ( separateCollectionTable != null && !attributeMapping.getCollectionDescriptor().isCascadeDeleteEnabled() ) {
 			// element-collection or many-to-many - delete the collection-table row
 
 			final NamedTableReference tableReference = new NamedTableReference(

hibernate-core/src/main/java/org/hibernate/query/sqm/mutation/internal/cte/CteDeleteHandler.java

@@ -77,7 +77,9 @@ protected void addDmlCtes(
 		SqmMutationStrategyHelper.visitCollectionTables(
 				(EntityMappingType) mutatingTableGroup.getModelPart(),
 				pluralAttribute -> {
-					if ( pluralAttribute.getSeparateCollectionTable() != null ) {
+					// Skip deleting rows in collection tables if cascade delete is enabled
+					if ( pluralAttribute.getSeparateCollectionTable() != null
+						&& !pluralAttribute.getCollectionDescriptor().isCascadeDeleteEnabled() ) {
 						// Ensure that the FK target columns are available
 						final boolean useFkTarget = !pluralAttribute.getKeyDescriptor()
 								.getTargetPart().isEntityIdentifierMapping();

hibernate-core/src/main/java/org/hibernate/query/sqm/mutation/internal/inline/InlineDeleteHandler.java

@@ -70,7 +70,9 @@ protected InlineDeleteHandler(
 			SqmMutationStrategyHelper.visitCollectionTables(
 					getEntityDescriptor(),
 					pluralAttribute -> {
-						if ( pluralAttribute.getSeparateCollectionTable() != null ) {
+						// Skip deleting rows in collection tables if cascade delete is enabled
+						if ( pluralAttribute.getSeparateCollectionTable() != null
+							&& !pluralAttribute.getCollectionDescriptor().isCascadeDeleteEnabled() ) {
 							// this collection has a separate collection table, meaning it is one of:
 							//		1) element-collection
 							//		2) many-to-many

hibernate-core/src/test/java/org/hibernate/orm/test/ondeletecascade/OnDeleteCollectionTest.java

@@ -7,12 +7,11 @@
 import jakarta.persistence.ElementCollection;
 import jakarta.persistence.Entity;
 import jakarta.persistence.Id;
-import jakarta.persistence.Inheritance;
-import jakarta.persistence.InheritanceType;
 import org.hibernate.Hibernate;
 import org.hibernate.annotations.OnDelete;
 import org.hibernate.annotations.OnDeleteAction;
 import org.hibernate.testing.orm.junit.EntityManagerFactoryScope;
+import org.hibernate.testing.orm.junit.Jira;
 import org.hibernate.testing.orm.junit.Jpa;
 import org.junit.jupiter.api.Test;
 
@@ -26,10 +25,12 @@
 @Jpa(annotatedClasses =
 		{OnDeleteCollectionTest.A.class},
 		useCollectingStatementInspector = true)
-//@RequiresDialectFeature(feature = DialectFeatureChecks.SupportsCascadeDeleteCheck.class)
 class OnDeleteCollectionTest {
-	@Test void test(EntityManagerFactoryScope scope) {
+	@Test
+	void test(EntityManagerFactoryScope scope) {
 		var inspector = scope.getCollectingStatementInspector();
+		inspector.clear();
+
 		scope.inTransaction( em -> {
 			A a = new A();
 			a.id = 2;
@@ -66,8 +67,38 @@ class OnDeleteCollectionTest {
 		});
 	}
 
+	@Test
+	@Jira("https://hibernate.atlassian.net/browse/HHH-19730")
+	void testBulk(EntityManagerFactoryScope scope) {
+		var inspector = scope.getCollectingStatementInspector();
+		inspector.clear();
+
+		scope.inTransaction( em -> {
+			A a = new A();
+			a.id = 2;
+			a.bs.add( "b" );
+			em.persist( a );
+		} );
+		inspector.assertExecutedCount( 2 );
+		inspector.clear();
+
+		scope.inTransaction( em -> {
+			em.createQuery( "delete from A" ).executeUpdate();
+			inspector.assertExecutedCount( scope.getDialect().supportsCascadeDelete() ? 1 : 2 );
+		} );
+		inspector.clear();
+
+		scope.inTransaction( em -> {
+			assertEquals( 0,
+					em.createNativeQuery( "select count(*) from A_bs", Integer.class )
+							.getSingleResultOrNull() );
+			assertEquals( 0,
+					em.createNativeQuery( "select count(*) from A", Integer.class )
+							.getSingleResultOrNull() );
+		});
+	}
+
 	@Entity(name = "A")
-	@Inheritance(strategy = InheritanceType.JOINED)
 	static class A {
 		@Id
 		long id;