dongjoon-hyun commented on a change in pull request #27405: 
[SPARK-30684][WEBUI] ] Show the descripton of metrics for WholeStageCodegen in 
DAG viz
URL: https://github.com/apache/spark/pull/27405#discussion_r373101165
 
 

 ##########
 File path: 
sql/core/src/main/scala/org/apache/spark/sql/execution/ui/SparkPlanGraph.scala
 ##########
 @@ -169,12 +169,17 @@ private[ui] class SparkPlanGraphNode(
       metric.name + ": " + value
     }
 
+    // If there are metrics, display each entry in a separate line.
+    // Note: whitespace between two "\n"s is to create an empty line between 
the name of
+    // SparkPlan and metrics. If removing it, it won't display the empty line 
in UI.
 
 Review comment:
   Thank you for the note.

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