Look at nullable annotations when retrieve single row

[kant2002]

When generation of code for nullable context, nullability of result type should affects if generated FirstOrDefault or simply First,

consider following definition

[SqlMarshal("sp")]
public partial Totals GetTotals();

produces

public partial Totals GetTotals()
{
...
return this.dbContext.Totals.FromSqlRaw(sqlQuery, parameters).AsEnumerable().FirstOrDefault();
...
}

which trigger nullability warnings