Method is_ever_expanding

datafusion/expr/src/window_frame.rs:295–297

Is the window frame ever-expanding (it always grows in the superset sense). Useful when understanding if set-monotonicity properties of functions can be exploited.

(&self)

    /// Useful when understanding if set-monotonicity properties of functions can
    /// be exploited.
    pub fn is_ever_expanding(&self) -> bool {
        self.start_bound.is_unbounded()
    }
}

/// There are five ways to describe starting and ending frame boundaries: