async def exists(self) -> bool:
        """
        Returns a bool value to confirm if there are rows matching the given criteria
        (applied with `filter` and `exclude` if set).

        :return: result of the check
        :rtype: bool
        """
        expr = self.build_select_expression()
        expr = sqlalchemy.exists(expr).select()
        return await self.database.fetch_val(expr)

        Returns a bool value to confirm if there are rows matching the given criteria
        (applied with `filter` and `exclude` if set).

        :return: result of the check
        :rtype: bool
        
ormar/queryset/queryset.py