Method map_children

datafusion/common/src/tree_node.rs:1288–1311

(
        self,
        f: F,
    )

    }

    fn map_children<F: FnMut(Self) -> Result<Transformed<Self>>>(
        self,
        f: F,
    ) -> Result<Transformed<Self>> {
        let children = self.arc_children();
        if !children.is_empty() {
            let new_children = children
                .into_iter()
                .cloned()
                .map_until_stop_and_collect(f)?;
            // Propagate up `new_children.transformed` and `new_children.tnr`
            // along with the node containing transformed children.
            if new_children.transformed {
                let arc_self = Arc::clone(&self);
                new_children.map_data(|new_children| {
                    self.with_new_arc_children(arc_self, new_children)
                })
            } else {
                Ok(Transformed::new(self, false, new_children.tnr))
            }
        } else {
            Ok(Transformed::no(self))
        }
    }
}

/// Instead of implementing [`TreeNode`], it's recommended to implement a [`ConcreteTreeNode`] for