@Override
  public SubscriptionPollPayload deserialize(final ByteBuffer buffer) {
    this.fileName = ReadWriteIOUtils.readString(buffer);
    this.fileLength = ReadWriteIOUtils.readLong(buffer);
    this.databaseName = ReadWriteIOUtils.readString(buffer);
    return this;
  }
The database name of the file (for table model only).
iotdb-client/service-rpc/src/main/java/org/apache/iotdb/rpc/subscription/payload/poll/FileSealPayload.java