public ManifestFile deleteManifest() {
        return deleteManifest;
    }
Copy from iceberg-flink:iceberg-flink-1.13:0.13.2
inlong-sort/sort-flink/sort-flink-v1.13/sort-connectors/iceberg/src/main/java/org/apache/inlong/sort/iceberg/sink/DeltaManifests.java