@Override
  public void prefetchRemainingResponses() {
    // do nothing
  }
The {@link SubscriptionEventSingleResponse} class represents a single subscription event response
that wraps a cached {@link SubscriptionPollResponse}. The actual payload of the response can be
either a {@link TerminationPayload} or an {@link ErrorPayload}.
iotdb-core/datanode/src/main/java/org/apache/iotdb/db/subscription/event/response/SubscriptionEventSingleResponse.java