Method pop

datafusion/functions-aggregate/src/min_max.rs:827–847

(&mut self)

    /// Removes and returns the last value of the sliding window.
    #[inline]
    pub fn pop(&mut self) -> Option<T> {
        if self.pop_stack.is_empty() {
            match self.push_stack.pop() {
                Some((val, _)) => {
                    let mut last = (val.clone(), val);
                    self.pop_stack.push(last.clone());
                    while let Some((val, _)) = self.push_stack.pop() {
                        let min = if last.1 < val {
                            last.1.clone()
                        } else {
                            val.clone()
                        };
                        last = (val.clone(), min);
                        self.pop_stack.push(last.clone());
                    }
                }
                None => return None,
            }
        }
        self.pop_stack.pop().map(|(val, _)| val)
    }

    /// Returns the number of elements stored in the sliding window.
    #[inline]