Github user gatorsmile commented on the issue:

    https://github.com/apache/spark/pull/16422
  
    After rethinking about it, `DESC EXTENDED/FORMATTED COLUMN` discloses the 
data patterns/statistics info. These info are pretty sensitive. Not all the 
users should be allowed to access it. 
    
    We might face the security-related complaints about this feature. Also cc 
@rxin @yhuai 


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