public static QsiColumnNode VisitColumnParseNode(ColumnParseNode node)
        {
            var columnNode = new QsiDeclaredColumnNode
            {
                Name = IdentifierVisitor.Visit(node)
            };

            PTree.RawNode[columnNode] = node;

            return(columnNode);
        }
 public SelectorPair(QsiDeclaredColumnNode column)
 {
     Column     = column;
     Expression = null;
 }