code: public void removeParameters(String... parameterNames)
    {
      Map<String, String[]> map = getMap();
      boolean needsRebuild = false;
      for (String name : parameterNames)
      {
        if(map.remove(name) != null)
          needsRebuild = true;
      }
      if(needsRebuild)
        rebuildQuery();
    }
docs: Remove parameter with given name and
  return its previous value.
  
  @param parameterNames