Method HistogramPercentile

library/cpp/expression/expression_variable.cpp:114–137

    return G(secondOperand) ? ToDouble() : secondOperand.ToDouble();
}
double TExpressionVariable::HistogramPercentile(const TExpressionVariable& percentile) const {
    if (!ToHistogramPointsAndBins().IsValidData(percentile.ToDouble())) {
        return 0;
    }

    const auto& result = ToHistogramPointsAndBins().FindBinAndPartion(percentile.ToDouble());
    const auto& binIndex = result.first;
    const auto& partion = result.second;

    // if percentile in [last point; +inf) return last point * 1.1
    if (static_cast<size_t>(binIndex) == ToHistogramPointsAndBins().GetBins().size() - 1) {
        return ToHistogramPointsAndBins().GetPoints().back() * 1.1;
    }

    auto leftBorderPoint = binIndex != 0 ? ToHistogramPointsAndBins().GetPoints()[binIndex - 1] : 0;
    auto rightBorderPoint = ToHistogramPointsAndBins().GetPoints()[binIndex];

    // if right border is max_int return left border * 1.1
    if (rightBorderPoint == std::numeric_limits<int>::max()) {
        return ToHistogramPointsAndBins().GetPoints()[ToHistogramPointsAndBins().GetPoints().size() - 2] * 1.1;
    }

    return leftBorderPoint + (rightBorderPoint - leftBorderPoint) * partion;
}
double TExpressionVariable::Or(const TExpressionVariable& secondOperand) const {
    return !(IsZeroDoubleValue() && secondOperand.IsZeroDoubleValue());
}