Github user zsxwing commented on the pull request:

    https://github.com/apache/spark/pull/7774#issuecomment-146581482
  
    > @zsxwing Why did you do that? It looks really dirty when I try to use 
Spark UI. Maybe Spark UI header isn't a good place for SQL tabs. What do you 
think?
    
    It's because we don't have a global place to put a single SQL tab there. 
Now the SQL tab needs to be a field of SQLContext. I think the major issue is 
SQLContext doesn't provide a stop method to remove the SQL tab from UI. Could 
you use only one SQLContext in your application?


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