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