Function polars_lazy::dsl::fold_exprs

pub fn fold_exprs<F, E>(acc: Expr, f: F, exprs: E) -> Exprwhere
    F: 'static + Fn(Series, Series) -> Result<Option<Series>, PolarsError> + Send + Sync + Clone,
    E: AsRef<[Expr]>,

Accumulate over multiple columns horizontally / row wise.