presto-main/src/main/java/io/prestosql/type/TinyintOperators.java/TinyintOperators/castToBigint
class TinyintOperators:    @ScalarOperator(CAST)
    @SqlType(StandardTypes.BIGINT)
    public static long castToBigint(@SqlType(StandardTypes.TINYINT) long value)
    {
        return value;
    }