$subQuery = $db->buildStatement(
		array(
				'fields'     => array('"ParentNode"."id"', '"ParentNode"."type"'),
				'table'      => $db->fullTableName($this->Node),
				'alias'      => 'ParentNode',
				'limit'      => null,
				'offset'     => null,
				'joins'      => array(),
				'conditions' => $conditionsSubQuery,
				'order'      => null,
				'group'      => null
		),
		$this->Node
);