Function polars::prelude::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]>,
Available on crate feature
lazy
only.Expand description
Accumulate over multiple columns horizontally / row wise.