Method project

datafusion/common/src/stats.rs:489–492

Project the statistics to the given column indices. For example, if we had statistics for columns `{"a", "b", "c"}`, projecting to `vec![2, 1]` would return statistics for columns `{"c", "b"}`.

(self, projection: Option<&impl AsRef<[usize]>>)

    /// projecting to `vec![2, 1]` would return statistics for columns `{"c",
    /// "b"}`.
    pub fn project(self, projection: Option<&impl AsRef<[usize]>>) -> Self {
        let projection = projection.map(AsRef::as_ref);
        self.project_impl(projection)
    }

    fn project_impl(mut self, projection: Option<&[usize]>) -> Self {
        let Some(projection) = projection.map(AsRef::as_ref) else {