// just in order to avoid compiler error that base type doesn't contain parameterless constructor
 public ColumnOperandWithOrdering(ColumnOperand columnOperand, SPSearch.OrderDirection orderDirection)
     : base(string.Empty)
 {
     if (!string.IsNullOrEmpty(columnOperand.ColumnName))
     {
         this.Initialize(columnOperand.ColumnName);
     }
     else
     {
         throw new ColumnOperandShouldContainNameException();
     }
     this._orderDirection = orderDirection;
 }
 public IOperand CreateColumnOperandWithOrdering(Expression expr, SPSearch.OrderDirection orderDirection)
 {
     var columnOperand = (ColumnOperand)CreateColumnOperand(expr, null);
     return new ColumnOperandWithOrdering(columnOperand, orderDirection);
 }