presto-hive/src/main/java/io/prestosql/plugin/hive/s3/PrestoS3FileSystem.java/PrestoS3InputStream/read
class PrestoS3InputStream:        @Override
        public int read()
        {
            // This stream is wrapped with BufferedInputStream, so this method should never be called
            throw new UnsupportedOperationException();
        }