@Override
  public List<String> getFieldNames() {
    if (formatJson) {
      return Collections.singletonList(STATS);
    }
    return Arrays.asList(PUFFIN_STATS_ENABLED, PUFFIN_STATS_BLOB);
  }
Collect the puffin stats summary for the table
iceberg/iceberg-handler/src/main/java/org/apache/iceberg/metasummary/PuffinStatisticsSummary.java