@Override
  public void toData(DataOutput out) throws IOException {
    super.toData(out);
    DataSerializer.writePrimitiveShort(functorId, out);
  }
This eval just applies to a single value or the 1st value in params
geode-core/src/main/java/org/apache/geode/internal/admin/statalerts/FunctionDecoratorImpl.java