presto-main/src/main/java/io/prestosql/type/setdigest/SetDigestOperators.java/SetDigestOperators/castToBinary
class SetDigestOperators:    @ScalarOperator(CAST)
    @SqlType(StandardTypes.VARBINARY)
    public static Slice castToBinary(@SqlType(SetDigestType.NAME) Slice slice)
    {
        return slice;
    }