framework/db/conditions/BetweenColumnsConditionBuilder.php
protected function escapeColumnName($columnName, &$params = [])
    {
        if ($columnName instanceof Query) {
            list($sql, $params) = $this->queryBuilder->build($columnName, $params);
            return "($sql)";
        } elseif ($columnName instanceof ExpressionInterface) {
            return $this->queryBuilder->buildExpression($columnName, $params);
        } elseif (strpos($columnName, '(') === false) {
            return $this->queryBuilder->db->quoteColumnName($columnName);
        }

        return $columnName;
    }
protected function escapeColumnName($columnName, &$params = [])
    {
        if ($columnName instanceof Query) {
            list($sql, $params) = $this->queryBuilder->build($columnName, $params);
            return "($sql)";
        } elseif ($columnName instanceof ExpressionInterface) {
            return $this->queryBuilder->buildExpression($columnName, $params);
        } elseif (strpos($columnName, '(') === false) {
            return $this->queryBuilder->db->quoteColumnName($columnName);
        }

        return $columnName;
    }
protected function escapeColumnName ( $ columnName , & $ params = [ ] ) { if ( $ columnName instanceof Query ) { list ( $ sql , $ params ) = $ this -> queryBuilder -> build ( $ columnName , $ params ) ; return "($sql)" ; } elseif ( $ columnName instanceof ExpressionInterface ) { return $ this -> queryBuilder -> buildExpression ( $ columnName , $ params ) ; } elseif ( strpos ( $ columnName , '(' ) === false ) { return $ this -> queryBuilder -> db -> quoteColumnName ( $ columnName ) ; } return $ columnName ; }
Prepares column name to be used in SQL statement.

@param Query|ExpressionInterface|string $columnName
@param array $params the binding parameters.
@return string
Prepares column name to be used in SQL statement .