Github user sethah commented on the issue:
https://github.com/apache/spark/pull/19680
I think it's important to restructure these summaries to inherit from the
same traits, so different methods can be re-used. That structure has to live
somewhere and there isn't really a logical place except its own module. The
individual implementation classes don't _have_ to move, as noted above, but it
is neater. I think it depends on how averse we are to breaking the
compatibility.
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