[GitHub] [spark] uncleGen opened a new pull request #28391: [SPARK-31593][SS] Remove unnecessary streaming query progress update

[GitBox]

uncleGen opened a new pull request #28391:
URL: https://github.com/apache/spark/pull/28391


   ### What changes were proposed in this pull request?
   
   Structured Streaming progress reporter will always report an `empty` 
progress when there is no new data. As design, we should provide progress 
updates every 10s (default) when there is no new data.
   
   Before PR:
   
   
![20200428175008](https://user-images.githubusercontent.com/7402327/80474832-88a8ca00-897a-11ea-820b-d4be6127d2fe.jpg)
   
![20200428175037](https://user-images.githubusercontent.com/7402327/80474844-8ba3ba80-897a-11ea-873c-b7137bd4a804.jpg)
   
![20200428175102](https://user-images.githubusercontent.com/7402327/80474848-8e061480-897a-11ea-806e-28c6bbf1fe03.jpg)
   
   After PR:
   
   
![image](https://user-images.githubusercontent.com/7402327/80475099-f35a0580-897a-11ea-8fb3-53f343df2c3f.png)
   
   ### Why are the changes needed?
   
   Fixes a bug around incorrect progress report
   
   
   ### Does this PR introduce any user-facing change?
   
   Fixes a bug around incorrect progress report
   
   
   ### How was this patch tested?
   
   existing ut and manual test
   


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