@Override
  public MergeAppend appendFile(DataFile file) {
    add(file);
    return this;
  }
@TestTemplate
  public void testDefaultPartitionSummaries() {
    table.newFastAppend().appendFile(FILE_A).commit();

    Set<String> partitionSummaryKeys =
        table.currentSnapshot().summary().keySet().stream()
            .filter(key -> key.startsWith(SnapshotSummary.CHANGED_PARTITION_PREFIX))
            .collect(Collectors.toSet());
    assertThat(partitionSummaryKeys).isEmpty();

    assertThat(table.currentSnapshot().summary())
        .doesNotContainKey(SnapshotSummary.PARTITION_SUMMARY_PROP)
        .containsEntry(SnapshotSummary.CHANGED_PARTITION_COUNT_PROP, "1");
  }