Method call

datafusion/expr/src/udwf.rs:135–139

creates a [`Expr`] that calls the window function with default values for `order_by`, `partition_by`, `window_frame`. See [`ExprFunctionExt`] for details on setting these values. This utility allows using a user defined window function without requiring access to the registry, such as with the DataFrame API. [`ExprFunctionExt`]: crate::expr_fn::ExprFunctionExt

(&self, args: Vec<Expr>)

    ///
    /// [`ExprFunctionExt`]: crate::expr_fn::ExprFunctionExt
    pub fn call(&self, args: Vec<Expr>) -> Expr {
        let fun = crate::WindowFunctionDefinition::WindowUDF(Arc::new(self.clone()));

        Expr::from(WindowFunction::new(fun, args))
    }

    /// Returns this function's name
    ///