qstommyshu commented on code in PR #15937:
URL: https://github.com/apache/datafusion/pull/15937#discussion_r2072660969


##########
datafusion/optimizer/src/test/mod.rs:
##########
@@ -242,6 +226,24 @@ pub fn assert_optimized_plan_eq_display_indent(
     assert_eq!(formatted_plan, expected);
 }
 
+#[macro_export]
+macro_rules! assert_optimized_plan_eq_display_indent_snapshot {
+    (
+        $rule:expr,
+        $plan:expr,
+        @ $expected:literal $(,)?
+    ) => {{
+        let optimizer = $crate::Optimizer::with_rules(vec![$rule]);
+        let optimized_plan = optimizer
+            .optimize($plan, &$crate::OptimizerContext::new(), |_, _| {})
+            .expect("failed to optimize plan");

Review Comment:
   Display ident schema is not only for snapshot testing, it is wildly used in 
many test files. I don't think adding comment here is needed.



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