cloud-fan opened a new pull request #28037: [SPARK-31271][UI] fix web ui for 
driver side SQL metrics
URL: https://github.com/apache/spark/pull/28037
 
 
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   ### What changes were proposed in this pull request?
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   In https://github.com/apache/spark/pull/23551, we changed the metrics type 
of driver-side SQL metrics to size/time etc. which comes with max/min/median 
info.
   
   This doesn't make sense for driver side SQL metrics as they have only one 
value. It makes the web UI hard to read:
   
![image](https://user-images.githubusercontent.com/3182036/77653892-42db9900-6fab-11ea-8e7f-92f763fa32ff.png)
   
   This PR updates the SQL metrics UI to only display max/min/median if there 
are more than one metrics values:
   
![image](https://user-images.githubusercontent.com/3182036/77653975-5f77d100-6fab-11ea-849e-64c935377c8e.png)
   
   
   ### Why are the changes needed?
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   Please clarify why the changes are needed. For instance,
     1. If you propose a new API, clarify the use case for a new API.
     2. If you fix a bug, you can clarify why it is a bug.
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   Makes the UI easier to read
   
   ### Does this PR introduce any user-facing change?
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   If yes, please clarify the previous behavior and the change this PR proposes 
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behavior difference if possible.
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   no
   
   ### How was this patch tested?
   manual test

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