private boolean currentFileOverlapped() {
    Statistics<? extends Serializable> fileStatistics = firstTimeSeriesMetadata.getStatistics();
    return !seqTimeSeriesMetadata.isEmpty()
            && orderUtils.isOverlapped(fileStatistics, seqTimeSeriesMetadata.get(0).getStatistics())
        || !unSeqTimeSeriesMetadata.isEmpty()
            && orderUtils.isOverlapped(
                fileStatistics, unSeqTimeSeriesMetadata.peek().getStatistics());
  }
Initialize the query data source. This method should be called <b>before any other methods</b>.

@param dataSource the query data source
iotdb-core/datanode/src/main/java/org/apache/iotdb/db/queryengine/execution/operator/source/SeriesScanUtil.java