Github user hvanhovell commented on the issue:

    https://github.com/apache/spark/pull/15090
  
    I would argue strongly against creating a single aggregate function to 
calculate all statistics, for a couple of reasons:
    
    1. This would create a tonne of duplicated code (integrating HLL+ nicely 
will be a pain).
    2. These functions have all been tested.
    
    I do like the idea of testing the actual collection of column statistics 
separately from the analyze columns command.


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