presto-main/src/main/java/io/prestosql/type/BigintOperators.java/BigintOperators/saturatedFloorCastToTinyint
class BigintOperators:    @ScalarOperator(SATURATED_FLOOR_CAST)
    @SqlType(StandardTypes.TINYINT)
    public static long saturatedFloorCastToTinyint(@SqlType(StandardTypes.BIGINT) long value)
    {
        return SignedBytes.saturatedCast(value);
    }