comphead commented on code in PR #11994:
URL: https://github.com/apache/datafusion/pull/11994#discussion_r1718554136


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datafusion/common/src/tree_node.rs:
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@@ -486,6 +486,9 @@ pub trait TreeNodeVisitor<'n>: Sized {
 /// A [Visitor](https://en.wikipedia.org/wiki/Visitor_pattern) for recursively
 /// rewriting [`TreeNode`]s via [`TreeNode::rewrite`].
 ///
+/// For example you can implement this trait on a struct to rewrite `Expr` or

Review Comment:
   should we add an example of it? 🤔 



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