Function ValidateColumnOutput

catboost/libs/eval_result/eval_result.cpp:77–188

    }

    void ValidateColumnOutput(
        const TVector<TVector<TString>>& outputColumns,
        const TDataProvider& pool,
        bool cvMode)
    {
        THashSet<TString> featureIds;
        for (const auto& featureMetaInfo : pool.MetaInfo.FeaturesLayout->GetExternalFeaturesMetaInfo()) {
            featureIds.emplace(featureMetaInfo.Name);
        }
        THashSet<TString> auxiliaryColumnNames;
        if (pool.MetaInfo.ColumnsInfo.Defined()) {
            for (const auto& columnMetaInfo : pool.MetaInfo.ColumnsInfo->Columns) {
                if (columnMetaInfo.Type == EColumn::Auxiliary && columnMetaInfo.Id) {
                    auxiliaryColumnNames.insert(columnMetaInfo.Id);
                }
            }
        }

        bool notQuantizedPool = bool(dynamic_cast<TRawObjectsDataProvider*>(pool.ObjectsData.Get()));

        for (const auto& columns : outputColumns) {
            bool hasPrediction = false;

            for (const auto& name : columns) {
                EPredictionType predictionType;
                if (TryFromString<EPredictionType>(name, predictionType)) {
                    hasPrediction = true;
                    continue;
                }

                EColumn columnType;
                if (TryFromString<EColumn>(ToCanonicalColumnName(name), columnType)) {
                    switch (columnType) {
                        case (EColumn::Label):
                            CB_ENSURE(
                                pool.MetaInfo.TargetCount > 0,
                                "bad output column name " << name << " (No target/label info in pool)"
                            );
                            break;
                        case (EColumn::Baseline):
                            CB_ENSURE(
                                pool.MetaInfo.BaselineCount > 0,
                                "bad output column name " << name << " (No baseline info in pool)"
                            );
                            break;
                        case (EColumn::Weight):
                            CB_ENSURE(
                                pool.MetaInfo.HasWeights,
                                "bad output column name " << name << " (No Weight info in pool)"
                            );
                            break;
                        case (EColumn::GroupId):
                            CB_ENSURE(
                                pool.MetaInfo.HasGroupId,
                                "bad output column name " << name << " (No GroupId info in pool)"
                            );
                            break;
                        case (EColumn::SubgroupId):