protected void onChunk(PageVisitor pageVisitor) throws IOException {
    currChunkHeader = reader.readChunkHeader(marker);
    if (currChunkHeader.getDataSize() == 0) {
      // empty value chunk
      return;
    }
    currMeasurementID = currChunkHeader.getMeasurementID();
    currTimeseriesID = new Pair<>(currDeviceID, currMeasurementID);

    int dataSize = currChunkHeader.getDataSize();
    onChunkData(pageVisitor, dataSize);
  }
@return true if the file should be scanned
iotdb-core/datanode/src/main/java/org/apache/iotdb/db/tools/utils/TsFileSequenceScan.java