kyoty opened a new pull request #32308:
URL: https://github.com/apache/spark/pull/32308


   ### What changes were proposed in this pull request?
   
   The DAG part of sql-execution page should can be hidden/expand instead of 
being displayed directly all the time.
   
   
   ### Why are the changes needed?
   
   1.if it is a particularly complex SQL, it would take a long time to render 
the svg, and the page will be stuck for a long time.
   2.sometimes we just want to look at the detail of execution plan, but DAG 
cannot be hidden, and it is often inconvenient to drag the scroll bar to view 
the execution plan information.
   
   ### Does this PR introduce _any_ user-facing change?
   Yes, the sql dag can be clicked as hidden or expand.
   
   ### How was this patch tested?
   manual test works well
   
   before modified:
   
![reproduce](https://user-images.githubusercontent.com/52202080/115831294-fda2c880-a443-11eb-9402-bfb2584a2ce9.gif)
   
   
   after modified:
   
   
![update](https://user-images.githubusercontent.com/52202080/115831233-e82d9e80-a443-11eb-8694-7aa29cdf20ca.gif)
   
   


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