public virtual OnModelAnnotationChangedNode VisitOnModelAnnotationChanged(OnModelAnnotationChangedNode node) => node;
 public override OnModelAnnotationChangedNode VisitOnModelAnnotationChanged(OnModelAnnotationChangedNode node)
 {
     Dispatcher._immediateConventionScope.OnModelAnnotationChanged(
         node.ModelBuilder, node.Name, node.Annotation, node.OldAnnotation);
     return(null);
 }