QueryChain::hasSubquery

public function hasSubquery()
{
	$elements = array_reverse($this->chain);

	foreach ($elements as $element)
	{
		/**
		 * @var $element QueryChainElement
		 */
		if ($element->getValue() instanceof ExpressionField && $element->getValue()->hasSubquery())
		{
			return true;
		}
	}

	return false;
}