public function getRealParameter($name)
    {
        $this->getParameter($name);

        if (null === $this->refParameters) {
            $this->refParameters = new \ReflectionProperty(SQLFilter::class, 'parameters');
            $this->refParameters->setAccessible(true);
        }

        $parameters = $this->refParameters->getValue($this->filter);

        return $parameters[$name]['value'];
    }