private void putIfPositive(
      Map<String, String> summary, String key, long value, boolean humanReadable) {
    if (value > 0) {
      put(summary, key, value, humanReadable);
    }
  }
Only position delete files will be generated
amoro-format-iceberg/src/main/java/org/apache/amoro/optimizing/MetricsSummary.java