HHH-18854 Minor refactoring in AbstractMutationCoordinator

With this change I can remove a lot of duplicate code in Hibernate
Reactive.

Author: DavideD

hibernate-core/src/main/java/org/hibernate/persister/entity/mutation/AbstractMutationCoordinator.java

@@ -28,6 +28,8 @@
 import org.hibernate.sql.model.ast.builder.MutationGroupBuilder;
 import org.hibernate.sql.model.ast.builder.RestrictedTableMutationBuilder;
 import org.hibernate.sql.model.internal.MutationOperationGroupFactory;
+import org.hibernate.sql.model.internal.OptionalTableUpdate;
+import org.hibernate.sql.model.jdbc.OptionalTableUpdateOperation;
 
 /**
  * Base support for coordinating mutations against an entity
@@ -82,8 +84,7 @@ protected MutationOperationGroup createOperationGroup(ValuesAnalysis valuesAnaly
 			case 0:
 				return MutationOperationGroupFactory.noOperations( mutationGroup );
 			case 1: {
-				final MutationOperation operation = mutationGroup.getSingleTableMutation()
-						.createMutationOperation( valuesAnalysis, factory() );
+				final MutationOperation operation = createOperation( valuesAnalysis, mutationGroup.getSingleTableMutation() );
 				return operation == null
 						? MutationOperationGroupFactory.noOperations( mutationGroup )
 						: MutationOperationGroupFactory.singleOperation( mutationGroup, operation );
@@ -116,6 +117,13 @@ protected MutationOperationGroup createOperationGroup(ValuesAnalysis valuesAnaly
 		}
 	}
 
+	/*
+	 * Used by Hibernate Reactive
+	 */
+	protected MutationOperation createOperation(ValuesAnalysis valuesAnalysis, TableMutation<?> singleTableMutation) {
+		return singleTableMutation.createMutationOperation( valuesAnalysis, factory() );
+	}
+
 	protected void handleValueGeneration(
 			AttributeMapping attributeMapping,
 			MutationGroupBuilder mutationGroupBuilder,