@Override
    public int[][] toNestedIndexes() {
      return Arrays.stream(projection).mapToObj(i -> new int[] {i}).toArray(int[][]::new);
    }
Create a {@link Projection} of a field range.
amoro-format-mixed/amoro-mixed-flink/amoro-mixed-flink-common/src/main/java/org/apache/amoro/flink/util/Projection.java