@Override
  public boolean equals(Object o) {
    return o instanceof DriverTaskId
        && ((DriverTaskId) o).fragmentInstanceId.equals(fragmentInstanceId)
        && ((DriverTaskId) o).pipelineId == pipelineId;
  }
the class of id of the pipeline driver task.
iotdb-core/datanode/src/main/java/org/apache/iotdb/db/queryengine/execution/schedule/task/DriverTaskId.java