Method evaluate

datafusion/functions-aggregate/src/stddev.rs:285–292

(&mut self)

    }

    fn evaluate(&mut self) -> Result<ScalarValue> {
        let variance = self.variance.evaluate()?;
        match variance {
            ScalarValue::Float64(None) => Ok(ScalarValue::Float64(None)),
            ScalarValue::Float64(Some(f)) => Ok(ScalarValue::Float64(Some(f.sqrt()))),
            _ => internal_err!("Variance should be f64"),
        }
    }

    fn size(&self) -> usize {
        align_of_val(self) - align_of_val(&self.variance) + self.variance.size()