Github user hvanhovell commented on the issue:

    https://github.com/apache/spark/pull/19222
  
    Ok, I missed that you had moved these into the base class. I still look 
forward to the benchmark :)...
    
    I still think that the hierarchy does give any benefit. All block 
subclasses implement `size`, `fill`, `setPageNum` & `getPageNum` in the same 
way, and the other methods are either unused or can be generalized without a 
problem. That leaves a few static constructors which can also be moved.


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