CStackCacheManager::SetLength

function SetLength($entity, $length)
{
	if (defined("BITRIX_SKIP_STACK_CACHE") && BITRIX_SKIP_STACK_CACHE)
		return;

	if(isset($this->cache[$entity]) && is_object($this->cache[$entity]))
		$this->cache[$entity]->SetLength($length);
	else
		$this->cacheLen[$entity] = $length;
}