Github user JoshRosen commented on the pull request:

    https://github.com/apache/spark/pull/6663#issuecomment-109177899
  
    Wow, this test suite seems to run an insane number of queries against 
Derby.  From YourKit's performance charts view:
    
    
![image](https://cloud.githubusercontent.com/assets/50748/8000694/0862d614-0b13-11e5-938b-c32d5ca8967b.png)
    
    That's nearly 2.5 million queries for ~700 test cases or roughly 3500 
queries / statements per test.  Can this be right or is YourKit measuring 
something different than I think it is?


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