public virtual OnForeignKeyRequirednessChangedNode VisitOnForeignKeyRequirednessChanged(
     OnForeignKeyRequirednessChangedNode node) => node;
 public override OnForeignKeyRequirednessChangedNode VisitOnForeignKeyRequirednessChanged(
     OnForeignKeyRequirednessChangedNode node)
 {
     Dispatcher._immediateConventionScope.OnForeignKeyRequirednessChanged(node.RelationshipBuilder);
     return(null);
 }