wangyum commented on code in PR #50368:
URL: https://github.com/apache/spark/pull/50368#discussion_r2033239144


##########
sql/core/src/main/scala/org/apache/spark/sql/execution/adaptive/AdaptiveSparkPlanExec.scala:
##########
@@ -352,8 +352,9 @@ case class AdaptiveSparkPlanExec(
           val newCost = costEvaluator.evaluateCost(newPhysicalPlan)
           if (newCost < origCost ||
             (newCost == origCost && currentPhysicalPlan != newPhysicalPlan)) {
-            logOnLevel("Plan changed:\n" +
-              sideBySide(currentPhysicalPlan.treeString, 
newPhysicalPlan.treeString).mkString("\n"))
+            lazy val plans = sideBySide(
+              currentPhysicalPlan.treeString, 
newPhysicalPlan.treeString).mkString("\n")
+            logOnLevel("Plan changed:\n" + plans)

Review Comment:
   Sorry, It was my mistake, I added this configuration myself:
   ```
   logger.adaptive.name = org.apache.spark.sql.execution.adaptive
   logger.adaptive.level = debug
   ```



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