Function deltalake::datafusion::logical_expr::interval_arithmetic::cardinality_ratio

pub fn cardinality_ratio(
    initial_interval: &Interval,
    final_interval: &Interval
) -> f64

This function computes the selectivity of an operation by computing the cardinality ratio of the given input/output intervals. If this can not be calculated for some reason, it returns 1.0 meaning fully selective (no filtering).