HeartSaVioR opened a new pull request #27687: [SPARK-30943][SS] Show "batch ID" 
in tool tip string for Structured Streaming UI graphs
URL: https://github.com/apache/spark/pull/27687
 
 
   ### What changes were proposed in this pull request?
   
   This patch changes the tool tip string in Structured Streaming UI graphs to 
show batch ID (and timestamp as well) instead of only showing timestamp, which 
was a key for DStream but no longer a key for Structured Streaming.
   
   This patch does some refactoring as there're some spots on confusion between 
js file for streaming and structured streaming.
   
   ### Why are the changes needed?
   
   In Structured Streaming, everything is aligned for "batch ID" where the UI 
is only showing timestamp - end users have to manually find and correlate batch 
ID and the timestamp which is clearly a huge pain.
   
   ### Does this PR introduce any user-facing change?
   
   No
   
   ### How was this patch tested?
   
   Manually tested. Screenshots:
   
   ![Screen Shot 2020-02-25 at 7 22 38 
AM](https://user-images.githubusercontent.com/1317309/75197701-40b2ce80-57a2-11ea-9578-c2eb2d1091de.png)
   ![Screen Shot 2020-02-25 at 7 22 44 
AM](https://user-images.githubusercontent.com/1317309/75197704-427c9200-57a2-11ea-9439-e0a8303d0860.png)
   ![Screen Shot 2020-02-25 at 7 22 58 
AM](https://user-images.githubusercontent.com/1317309/75197706-43152880-57a2-11ea-9617-1276c3ba181e.png)
   ![Screen Shot 2020-02-25 at 7 23 04 
AM](https://user-images.githubusercontent.com/1317309/75197708-43152880-57a2-11ea-9de2-7d37eaf88102.png)
   ![Screen Shot 2020-02-25 at 7 23 31 
AM](https://user-images.githubusercontent.com/1317309/75197710-43adbf00-57a2-11ea-9ae4-4e292de39c36.png)
   

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