return err
	}
	for _, rt := range e.Right {
		err = rt.Right.aggregateRow(r, tableAlias)
		if err != nil {
			return err
		}
	}
	return nil
}

func (e *MultOp) aggregateRow(r Record, tableAlias string) error {
	err := e.Left.aggregateRow(r, tableAlias)
	if err != nil {
		return err
	}
	for _, rt := range e.Right {
		err = rt.Right.aggregateRow(r, tableAlias)
		if err != nil {