Method median

datafusion/expr-common/src/statistics.rs:143–151

Extracts the median value of this uncertain quantity, depending on its distribution: - A [`Uniform`] distribution's interval determines its median value, which is the arithmetic average of the interval endpoints. - An [`Exponential`] distribution's median is calculable by the formula `offset + ln(2) / λ`, where `λ` is the (non-negative) rate. - A [`Gaussian`] distribution's median is equal to its

(&self)

    /// - A [`Generic`] distribution _may_ have it explicitly, or this information
    ///   may be absent.
    pub fn median(&self) -> Result<ScalarValue> {
        match &self {
            Uniform(u) => u.median(),
            Exponential(e) => e.median(),
            Gaussian(g) => Ok(g.median().clone()),
            Bernoulli(b) => b.median(),
            Generic(u) => Ok(u.median().clone()),
        }
    }

    /// Extracts the variance value of this uncertain quantity, depending on
    /// its distribution: