public int getNextOffset() {
    return nextOffset;
  }
The field to be filled in the next {@link PollTabletsPayload} request.

<ul>
  <li>If nextOffset is 1, it indicates that the current payload is the first payload (its
      tablets are empty) and the fetching should continue.
  <li>If nextOffset is negative (or zero), it indicates all tablets have been fetched, and
      -nextOffset represents the total number of tablets.
</ul>
iotdb-client/service-rpc/src/main/java/org/apache/iotdb/rpc/subscription/payload/poll/TabletsPayload.java