[GitHub] [spark] cloud-fan commented on a change in pull request #28037: [SPARK-31271][UI] fix web ui for driver side SQL metrics

[GitBox <gi...@apache.org>]

cloud-fan commented on a change in pull request #28037: [SPARK-31271][UI] fix web ui for driver side SQL metrics
URL: https://github.com/apache/spark/pull/28037#discussion_r399905645
 
 

 ##########
 File path: sql/core/src/main/scala/org/apache/spark/sql/execution/metric/SQLMetrics.scala
 ##########
 @@ -204,19 +204,21 @@ object SQLMetrics {
       }
 
       val validValues = values.filter(_ >= 0)
-      val Seq(sum, min, med, max) = {
-        val metric = if (validValues.isEmpty) {
-          val zeros = Seq.fill(4)(0L)
-          zeros.map(v => strFormat(v))
-        } else {
+      // When there are only 1 metrics value (or None), no need to display max/min/median. This is
+      // common for driver-side SQL metrics.
+      if (validValues.length <= 1) {
+        strFormat(validValues.headOption.getOrElse(0))
+      } else {
+        val Seq(sum, min, med, max) = {
           Arrays.sort(validValues)
-          Seq(strFormat(validValues.sum), strFormat(validValues(0)),
+          Seq(
+            strFormat(validValues.sum),
+            strFormat(validValues(0)),
             strFormat(validValues(validValues.length / 2)),
-            s"${strFormat(validValues(validValues.length - 1))} $stringMetric")
+            strFormat(validValues(validValues.length - 1)))
         }
-        metric
+        s"total $METRICS_NAME_SUFFIX\n$sum ($min, $med, $max $taskInfo)"
       }
-      s"\n$sum ($min, $med, $max)"
 
 Review comment:
   I think it was a mistake. We should have the task info for all the max values.
   
   BTW thanks for catching! I didn't realize it when I was working on this PR ...

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