Function check_system_result

fn check_system_result<'a, T>(
    result: &'a SmallVec<[Row; 1]>,
    name: String,
    expected: T,
) -> Result<(), SqlServerError>
where
    T: FromSql<'a> + Copy + Debug + Display + PartialEq,

Helper function to parse an expected result from a “system” query.