HeartSaVioR commented on issue #26201: [SPARK-29543][SS][UI] Init structured 
streaming ui
URL: https://github.com/apache/spark/pull/26201#issuecomment-544848464
 
 
   Amazing work! I've seen multiple requests on having tab for structured 
streaming be equivalent to streaming tab, and happy to see this effort.
   
   I've just skimmed through the code (don't know about front-end tech.) and 
have general comment:
   
   * It may be better to define a new event for SQL and pass through listener 
bus, so that it could be available to SHS as well. It seems to be the right 
approach even we just want to expose it in running application.
   * Is there any chance to reuse resources for streaming tab? It's basically 
close to streaming tab, but looks like it doesn't reuse anything.
   * At least we could add UTs for API layer.
   * It would be great if statistic page would have query information as well 
on top.

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