}

  public void testMapWithIndex_arrayListSource() {
    testMapWithIndex(elems -> new ArrayList<>(elems).stream());
  }

  public void testMapWithIndex_linkedHashSetSource() {
    testMapWithIndex(elems -> new LinkedHashSet<>(elems).stream());
  }

  public void testMapWithIndex_unsizedSource() {
    testMapWithIndex(
        elems ->
            Stream.<@Nullable Object>of((Object) null)

  Map<Element, Element> map;

  CollectionBenchmarkSampleData elems;

  @Param({"0", "1", "100", "10000"})
  int elements;

  @BeforeExperiment
  public void prepareContents() throws Exception {
    mapsImpl = mapEnums.get(implName);
    elems = new CollectionBenchmarkSampleData(elements);
    contents = Maps.newHashMap();
    for (Element key : elems.getValuesInSet()) {
      contents.put(key, key);
    }

        final List<Map<String, Object>> resList = new ArrayList<>();
        for (Map<String, Object> elem : logList) {
            logger.info("config_id: {}, session_id: {}", configId, elem.get("session_id"));
            if (elem.containsKey("session_id") && elem.get("session_id").equals(configId.replace('-', '_'))) {
                resList.add(elem);
            }
        }
        return resList;
    }

        for (Map<String, Object> elem : jobLogList) {
            deleteMethod("/api/admin/joblog/log/" + elem.get("id"));
        }

        final List<Map<String, Object>> crawlingInfoList = readCrawlingInfo(fileConfigId);
        for (Map<String, Object> elem : crawlingInfoList) {
            deleteMethod("/api/admin/crawlinginfo/log/" + elem.get("id"));
        }

            while (itr1.hasNext()) {
              E elem1 = itr1.next();
              if (!set2.contains(elem1)) {
                return elem1;
              }
            }
            while (itr2.hasNext()) {
              E elem2 = itr2.next();
              if (!set1.contains(elem2)) {
                return elem2;
              }
            }
            return endOfData();
          }

        for (Map<String, Object> elem : jobLogList) {
            deleteMethod("/api/admin/joblog/log/" + elem.get("id"));
        }

        final List<Map<String, Object>> crawlingInfoList = readCrawlingInfo(webConfigId);
        for (Map<String, Object> elem : crawlingInfoList) {
            deleteMethod("/api/admin/crawlinginfo/log/" + elem.get("id"));
        }

     */
    @CheckForNull private AvlNode<E> pred;
    @CheckForNull private AvlNode<E> succ;

    AvlNode(@ParametricNullness E elem, int elemCount) {
      checkArgument(elemCount > 0);
      this.elem = elem;
      this.elemCount = elemCount;
      this.totalCount = elemCount;
      this.distinctElements = 1;
      this.height = 1;
      this.left = null;

      // assumes that each set is a singleton or less (as is done for the samples)
      for (Object elem : elements) {
        @SuppressWarnings("unchecked") // safe by generator contract
        Entry<String, Collection<Integer>> entry = (Entry<String, Collection<Integer>>) elem;
        Integer value = Iterables.getOnlyElement(entry.getValue());
        builder.put(entry.getKey(), value);
      }

      // uncheckedCastNullableTToT is safe because bufferSize > 0.
      if (comparator.compare(elem, uncheckedCastNullableTToT(threshold)) > 0) {
        threshold = elem;
      }
      // uncheckedCastNullableTToT is safe because bufferSize > 0.
    } else if (comparator.compare(elem, uncheckedCastNullableTToT(threshold)) < 0) {
      // Otherwise, we can ignore elem; we've seen k better elements.
      buffer[bufferSize++] = elem;

            } catch (Exception e) {
                throw new RuntimeException(e);
            }
        }

        private <T> Set<T> concat(Set<T> set, T elem) {
            Set<T> newSet = new HashSet<>(set);
            newSet.add(elem);
            return newSet;
        }

        @SuppressWarnings("checkstyle:parameternumber")
        private InterimResult build(