Trait polars_lazy::dsl::ExprEvalExtension

pub trait ExprEvalExtension: IntoExpr + Sized {
    fn cumulative_eval(
        self,
        expr: Expr,
        min_periods: usize,
        parallel: bool
    ) -> Expr { ... }
}

Available on crate feature cumulative_eval only.

Provided Methods

fn cumulative_eval(self, expr: Expr, min_periods: usize, parallel: bool) -> Expr

Run an expression over a sliding window that increases 1 slot every iteration.

Warning

this can be really slow as it can have O(n^2) complexity. Don’t use this for operations that visit all elements.

Implementors

impl ExprEvalExtension for Expr