SQLBuilder\Driver\BaseDriver::quoteIdentifier PHP Method

    public abstract function quoteIdentifier($id);

 public function toSql(BaseDriver $driver, ArgumentArray $args)
 {
     $sql = '';
     if ($driver instanceof MySQLDriver) {
         $sql = 'CHANGE COLUMN ';
         if (is_string($this->fromColumn)) {
             $sql .= $driver->quoteIdentifier($this->fromColumn);
         } elseif ($this->fromColumn instanceof Column) {
             $sql .= $driver->quoteIdentifier($this->fromColumn->getName());
         }
         // the 'toColumn' must be a type of Column, we need at least column type to rename.
         // $sql .= ' ' . $driver->quoteIdentifier($this->toColumn->getName()) . ' ' . $this->toColumn->getType();
         $sql .= ' ' . $this->toColumn->buildDefinitionSql($driver, $args);
     } elseif ($driver instanceof PgSQLDriver) {
         // ALTER TABLE distributors RENAME CONSTRAINT zipchk TO zip_check;
         $sql = 'RENAME COLUMN ';
         if (is_string($this->fromColumn)) {
             $sql .= $driver->quoteIdentifier($this->fromColumn);
         } elseif ($this->fromColumn instanceof Column) {
             $sql .= $driver->quoteIdentifier($this->fromColumn->getName());
         }
         // the 'toColumn' must be a type of Column, we need at least column type to rename.
         $sql .= ' TO ' . $driver->quoteIdentifier($this->toColumn->getName());
     } else {
         throw new UnsupportedDriverException($driver, $this);
     }
     return $sql;
 }