/**
  * Returns the results at the inner sink port extender. Does not include a possible performance
  * vector at the respective input. {@link #executeSubprocess()} or {@link #getPerformance()} must
  * have been called earlier.
  *
  * @throws UserError
  */
 protected Collection<IOObject> getInnerResults() throws UserError {
   return innerSinkExtender.getData(IOObject.class);
 }