Function GetDsvColumnCount

catboost/libs/data/cb_dsv_loader.cpp:409–419

    }

    size_t GetDsvColumnCount(const TPathWithScheme& pathWithScheme, const TDsvFormatOptions& format) {
        CB_ENSURE_INTERNAL(pathWithScheme.Scheme == "dsv", "Unsupported scheme " << pathWithScheme.Scheme);
        TString firstLine;
        CB_ENSURE(
            GetLineDataReader(pathWithScheme, format)->ReadLine(&firstLine),
            "TCBDsvDataLoader: no data rows in pool"
        );
        return TVector<TString>(
            NCsvFormat::CsvSplitter(firstLine, format.Delimiter, format.IgnoreCsvQuoting ? '\0' : '"')
        ).size();
    }

    static void AugmentWithExternalFeatureNames(
        TConstArrayRef<TString> featureNames,