/**
* Simplify the query by flattening out subqueries.
* Modifies the passed query object directly.
*/
public function simplify(Query $query)
{
$arPatterns = $query->getResultPart();
self::dropEmpty($arPatterns);
$arPlan = $this->createPlan($arPatterns);
if (count($arPlan) == 0) {
$query->setResultPart($arPatterns);
return 0;
}
$this->executePlan($arPatterns, $arPlan);
$query->setResultPart($arPatterns);
}
