def as_sql(self, qn, connection):
        if connection.vendor == 'salesforce':
            sql, params = qn.compile(self.lhs)
            return ((sql, ('=' if self.rhs else '!=')) % '%s %s null'), params
        else:
            return super(IsNull, self).as_sql(qn, connection)
dataset/ETHPy150Open django-salesforce/django-salesforce/salesforce/backend/compiler.py/IsNull.as_sql/swapped operands of `%`