Method sum

src/transform/src/analysis.rs:1563–1565

(iter: I)

    impl std::iter::Sum for CardinalityEstimate {
        fn sum<I: Iterator<Item = Self>>(iter: I) -> Self {
            iter.fold(CardinalityEstimate::from(0.0), |acc, elt| acc + elt)
        }
    }

    impl std::iter::Product for CardinalityEstimate {