Base::getProductSelect

protected function getProductSelect($iblockId, array $selectFields)
{
	if (!$this->useCatalog)
		return $selectFields;

	$additionalFields = $this->getProductFields($iblockId);
	$result = $selectFields;

	if (!empty($additionalFields))
	{
		$result = array_merge($result, $additionalFields);
		$result = array_unique($result);
	}
	unset($additionalFields);

	return $result;
}