diff --git a/datafusion/expr/src/tree_node/expr.rs b/datafusion/expr/src/tree_node/expr.rs
index ee775b4012de..ac101659b72c 100644
--- a/datafusion/expr/src/tree_node/expr.rs
+++ b/datafusion/expr/src/tree_node/expr.rs
@@ -480,3 +480,37 @@ where
     }
     Ok(v)
 }
+
+#[cfg(test)]
+mod test {
+    use std::time::Instant;
+    use datafusion_common::tree_node::{Transformed, TreeNode, TreeNodeRecursion};
+    use crate::{lit, Expr, and};
+
+    fn create_and_tree(level: u32) -> Expr {
+        if level == 0 {
+            lit(true)
+        } else {
+            and(create_and_tree(level - 1), create_and_tree(level - 1))
+        }
+    }
+
+    #[test]
+    fn transform_test() {
+        let now = Instant::now();
+        let mut and_tree = create_and_tree(25);
+        println!("create_and_tree: {}", now.elapsed().as_millis());
+
+        let now = Instant::now();
+        and_tree = and_tree.transform_down_old(&mut |e| Ok(Transformed::No(e))).unwrap();
+        println!("and_tree.transform_down_old: {}", now.elapsed().as_millis());
+
+        let now = Instant::now();
+        let mut and_tree_clone = and_tree.clone();
+        println!("and_tree.clone: {}", now.elapsed().as_millis());
+
+        let now = Instant::now();
+        and_tree_clone.transform_down(&mut |e| Ok(TreeNodeRecursion::Continue)).unwrap();
+        println!("and_tree_clone.transform_down: {}", now.elapsed().as_millis());
+    }
+}