@Override
    protected Supplier<AppendFiles> tableStoreDelegateSupplier(Table tableStore) {
      return () -> newAppendFiles(tableStore);
    }
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