Function polars_plan::dsl::functions::cum_reduce_exprs

pub fn cum_reduce_exprs<F, E: AsRef<[Expr]>>(f: F, exprs: E) -> Expr
where
    F: Fn(Series, Series) -> PolarsResult<Option<Series>> + Send + Sync + Clone + 'static,

Accumulate over multiple columns horizontally / row wise.