Inheritance: SingleQueryPlanNode
        protected virtual IQueryPlanNode VisitMarker(MarkerNode node)
        {
            var child = node.Child;

            if (child != null)
            {
                child = VisitNode(child);
            }

            return(new MarkerNode(child, node.MarkName));
        }
        protected virtual IQueryPlanNode VisitMarker(MarkerNode node)
        {
            var child = node.Child;
            if (child != null)
                child = VisitNode(child);

            return new MarkerNode(child, node.MarkName);
        }