public @NotNull Map<LookupElement, List<Pair<String, Object>>> getRelevanceObjects(@NotNull Iterable<? extends LookupElement> items,
                                                                               boolean hideSingleValued) {
    return Collections.emptyMap();
  }
public @NotNull Map<LookupElement, List<Pair<String, Object>>> getRelevanceObjects(@NotNull Iterable<? extends LookupElement> items,
                                                                               boolean hideSingleValued)