Method plan_window

datafusion/functions-window/src/planner.rs:33–126

(
        &self,
        raw_expr: RawWindowExpr,
    )

impl ExprPlanner for WindowFunctionPlanner {
    fn plan_window(
        &self,
        raw_expr: RawWindowExpr,
    ) -> Result<PlannerResult<RawWindowExpr>> {
        let RawWindowExpr {
            func_def,
            args,
            partition_by,
            order_by,
            window_frame,
            filter,
            null_treatment,
            distinct,
        } = raw_expr;

        let origin_expr = Expr::from(WindowFunction {
            fun: func_def,
            params: WindowFunctionParams {
                args,
                partition_by,
                order_by,
                window_frame,
                filter,
                null_treatment,
                distinct,
            },
        });

        let saved_name = NamePreserver::new_for_projection().save(&origin_expr);

        let Expr::WindowFunction(window_fun) = origin_expr else {
            unreachable!("")
        };
        let WindowFunction {
            fun,
            params:
                WindowFunctionParams {
                    args,
                    partition_by,
                    order_by,
                    window_frame,
                    null_treatment,
                    distinct,
                    filter,
                },
        } = *window_fun;
        let raw_expr = RawWindowExpr {
            func_def: fun,
            args,
            partition_by,
            order_by,
            window_frame,
            filter,
            null_treatment,
            distinct,
        };

        // TODO: remove the next line after `Expr::Wildcard` is removed