peter-toth commented on code in PR #13467:
URL: https://github.com/apache/datafusion/pull/13467#discussion_r1848396994
##########
datafusion/common/src/tree_node.rs:
##########
@@ -769,6 +770,263 @@ impl<T> Transformed<T> {
}
}
+/// [`Container`] contains elements that a function can be applied on or
mapped. The
+/// elements of the container are siblings so the continuation rules are
similar to
+/// [`TreeNodeRecursion::visit_sibling`] / [`Transformed::transform_sibling`].
+pub trait Container<'a, T: 'a>: Sized {
+ fn apply_elements<F: FnMut(&'a T) -> Result<TreeNodeRecursion>>(
+ &'a self,
+ f: F,
+ ) -> Result<TreeNodeRecursion>;
+
+ fn map_elements<F: FnMut(T) -> Result<Transformed<T>>>(
Review Comment:
Sure, I added comments in
https://github.com/apache/datafusion/pull/13467/commits/2097bc7603097f4106d68be9f1b6a281d4bdbb7e
to clarify how these methods are used.
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