presto-main/src/main/java/io/prestosql/operator/scalar/MathFunctions.java/MathFunctions/roundTinyint
class MathFunctions:    @Description("round to nearest integer")
    @ScalarFunction("round")
    @SqlType(StandardTypes.TINYINT)
    public static long roundTinyint(@SqlType(StandardTypes.TINYINT) long num)
    {
        return num;
    }