Granada\ORM::_add_result_column PHP Method

    protected function _add_result_column($expr, $alias = null)
    {
        if (!is_null($alias)) {
            $expr .= " AS " . $this->_quote_identifier($alias);
        }
        if ($this->_using_default_result_columns) {
            $this->_result_columns = array($expr);
            $this->_using_default_result_columns = false;
        } else {
            $this->_result_columns[] = $expr;
        }
        return $this;
    }