Method evaluate

datafusion/functions-aggregate/src/average.rs:521–532

(&mut self)

    }

    fn evaluate(&mut self) -> Result<ScalarValue> {
        // In sliding-window mode `retract_batch` can bring `count` back to 0
        // while `sum` remains `Some(..)` (possibly zero or a floating-point
        // residual). Guard against that so the frame with no non-NULL values
        // yields NULL rather than NaN / ±Inf.
        let avg = if self.count == 0 {
            None
        } else {
            self.sum.map(|f| f / self.count as f64)
        };
        Ok(ScalarValue::Float64(avg))
    }

    fn size(&self) -> usize {
        size_of_val(self)