src/orm/classes/Driver/MySQL.php
protected function getIndexDefinition($name, array $params)
    {
        foreach ($params['fields'] as &$fieldName)
        {
            $fieldName = "`$fieldName`";
        }
        $sql = parent::getIndexDefinition($name, $params);
        return $sql;
    }
protected function getIndexDefinition($name, array $params)
    {
        foreach ($params['fields'] as &$fieldName)
        {
            $fieldName = "`$fieldName`";
        }
        $sql = parent::getIndexDefinition($name, $params);
        return $sql;
    }
Возвращает объявление индекса

@param string $name
@param array  $params

@return string  SQL