presto-hive/src/main/java/io/prestosql/plugin/hive/s3/PrestoS3FileSystem.java/PrestoS3FileSystem/append
class PrestoS3FileSystem:    @Override
    public FSDataOutputStream append(Path f, int bufferSize, Progressable progress)
    {
        throw new UnsupportedOperationException("append");
    }