@Override
    protected MixedAppendFiles updateWithoutWatermark(Supplier<AppendFiles> delegateSupplier) {
      return new MixedAppendFiles(table, delegateSupplier.get());
    }
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