Function CheckGroupIds

catboost/libs/data/objects.cpp:35–88

template <class TGroupIdClass>
static void CheckGroupIds(
    ui32 objectCount,
    TMaybeData<TConstArrayRef<TGroupIdClass>> groupIds,
    TMaybe<TObjectsGroupingPtr> objectsGrouping
) {
    if (!groupIds) {
        return;
    }
    auto groupIdsData = *groupIds;

    CheckDataSize(groupIdsData.size(), (size_t)objectCount, "group Ids", false);


    TVector<TGroupIdClass> groupGroupIds;
    TGroupBounds currentGroupBounds(0); // used only if objectsGrouping is defined

    if (objectsGrouping.Defined()) {
        CheckDataSize(
            groupIdsData.size(),
            (size_t)(*objectsGrouping)->GetObjectCount(),
            "group Ids",
            false,
            "objectGrouping's object count",
            true
        );

        groupGroupIds.reserve((*objectsGrouping)->GetGroupCount());
        currentGroupBounds = (*objectsGrouping)->GetGroup(0);
    }

    TGroupIdClass lastGroupId = groupIdsData[0];
    groupGroupIds.emplace_back(lastGroupId);

    // using ui32 for counters/indices here is safe because groupIdsData' size was checked above
    for (auto objectIdx : xrange(ui32(1), ui32(groupIdsData.size()))) {
        if (groupIdsData[objectIdx] != lastGroupId) {
            if (objectsGrouping.Defined()) {
                CB_ENSURE_INTERNAL(
                    objectIdx == currentGroupBounds.End,
                    "objectsGrouping and grouping by groupId have different ends for group #"
                    << (groupGroupIds.size() - 1)
                );
                currentGroupBounds = (*objectsGrouping)->GetGroup((ui32)groupGroupIds.size());
            }

            lastGroupId = groupIdsData[objectIdx];
            groupGroupIds.emplace_back(lastGroupId);
        }
    }

    Sort(groupGroupIds);
    auto it = std::adjacent_find(groupGroupIds.begin(), groupGroupIds.end());
    CB_ENSURE(it == groupGroupIds.end(), "group Ids are not consecutive");
}

static bool HaveMoreThanOneKeyOrAnyValueMismatch(
    const THashMap<ui32, TString>& lhs,