TaskQueryBuilder::getSubordinateField

private function getSubordinateField(): ExpressionField
{
	$subordinateQuery = $this->getSubordinateSql();
	if (!empty($subordinateQuery))
	{
		$field = (new ExpressionField(
			'SUBORDINATE',
			$subordinateQuery,
			['RESPONSIBLE_ID', 'CREATED_BY', 'ID']
		));
	}
	else
	{
		$field = new ExpressionField('SUBORDINATE', "'N'");
	}

	return $field;
}