@Override
    protected MixedAppendFiles updateWithWatermark(
        Transaction transaction, boolean autoCommitTransaction) {
      return new MixedAppendFiles(
          table, newAppendFiles(transaction), transaction, autoCommitTransaction);
    }
Implementation of {@link AppendFiles} for mixed-format table, adding tracing and watermark
generating logics.
amoro-format-iceberg/src/main/java/org/apache/amoro/op/MixedAppendFiles.java