code: public Function<ResultType, ResultType> makePostComputeManipulatorFn(QueryType query, MetricManipulationFn fn)
    {
      return makePreComputeManipulatorFn(query, fn);
    }
docs: Generally speaking this is the exact same thing as makePreComputeManipulatorFn.  It is leveraged in
  order to compute PostAggregators on results after they have been completely merged together, which
  should actually be done in the mergeResults() call instead of here.
  <p>
  This should never actually be overridden and it should be removed as quickly as possible.
  
  @param query The Query that is currently being processed
  @param fn    The function that should be applied to all metrics in the results
  
  @return A function that will apply the provided fn to all metrics in the input ResultType object