Method resize

datafusion/functions-aggregate/src/variance.rs:439–443

(&mut self, total_num_groups: usize)

    }

    fn resize(&mut self, total_num_groups: usize) {
        self.m2s.resize(total_num_groups, 0.0);
        self.means.resize(total_num_groups, 0.0);
        self.counts.resize(total_num_groups, 0);
    }

    fn merge<F>(
        group_indices: &[usize],