code: public List<DataSlice> getPersistentData() {
      List<DataSlice> slices = new ArrayList<DataSlice>(1);
      slices.add(new DataSlice(schema.toByteArray()));
      return slices;
    }
docs: The serialized form is wrapped in a DataSlice and returned in a single-entry List. SIB0112b.mfp.1