Looks straightforward at a quick read-through. I have just a couple of
questions. How much of the performance gain comes from avoiding the
FunctionCallInvoke overhead, by simply having SortSupport with a
comparison function, and how much comes from the "abbreviation"?
Also, is it worth the cycles and code to have the hyperloglog estimator,
and aborting the abbreviation if there are only a few distinct values.
Or put another way, how much does the abbreviation slow things down in
the worst case?
- Heikki
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