@Override
  public void process(Event event, EventCollector eventCollector) throws Exception {
    eventCollector.collect(event);
  }
If data comes in {@link TsFileInsertionEvent}, we will not split it into {@link
TabletInsertionEvent} by default, because the data in {@link TsFileInsertionEvent} is already
compressed, down-sampling may not reduce the size of data but will surely increase the CPU
usage.
iotdb-core/datanode/src/main/java/org/apache/iotdb/db/pipe/processor/downsampling/DownSamplingProcessor.java