public FilesStatistics getOutputFilesStatistics() {
    FilesStatisticsBuilder outputBuilder = new FilesStatisticsBuilder();
    outputBuilder.addFiles(newFileSize, newFileCnt);
    return outputBuilder.build();
  }
Only position delete files will be generated
amoro-format-iceberg/src/main/java/org/apache/amoro/optimizing/MetricsSummary.java