public void NpgsqlCircleConstructorTest()
        {
            SqlExpression circle = SqlDml.Native("circle'<(0,1),10>'");

            CheckEquality(
                PostgresqlSqlDml.NpgsqlCircleConstructor(
                    PostgresqlSqlDml.NpgsqlPointConstructor(0, 1),
                    10),
                circle);

            CheckEquality(
                PostgresqlSqlDml.NpgsqlCircleConstructor(
                    SqlDml.Native("point'(0,1)'"),
                    10),
                circle);
        }