// @Override
        public HavingBuilder having(String columnExpression)
        {
            SelectItemParser parser     = new SelectItemParser(_query, false);
            SelectItem       selectItem = parser.findSelectItem(columnExpression);

            return(having(selectItem));
        }
        } // createOperand()

        private SelectItem findSelectItem(string expression, bool allowExpressionBasedSelectItem)
        {
            SelectItemParser parser = new SelectItemParser(this, allowExpressionBasedSelectItem);

            return(parser.findSelectItem(expression));
        } // findSelectItem()