Github user zecevicp commented on the issue:

    https://github.com/apache/spark/pull/21109
  
    @mgaido91 Regarding the amount of code, maybe you can suggest how to reduce 
it? Because I don't see a way...
    I think the code is well contained (mostly in separate new classes) and is 
not contaminating the existing codebase. There is a simple switch (parameter) 
that turns off the whole thing.
    Some code also went into the use cases which contribute to the amount of 
changes.
    I believe that the potentially significant speedup justifies the line count.


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