@Override
  @Nullable
  public Map<Integer, ByteBuffer> lowerBounds() {
    if (lowerBounds == null) {
      return null;
    }
    return lowerBounds.entrySet().stream()
        .collect(toImmutableMap(Map.Entry::getKey, entry -> ByteBuffer.wrap(entry.getValue())));
  }
Copy from trino-iceberg TrinoDeleteFile and do some change to adapt mixed-format table
amoro-format-mixed/amoro-mixed-trino/src/main/java/org/apache/amoro/trino/delete/TrinoDeleteFile.java