Github user JoshRosen commented on the pull request:
https://github.com/apache/spark/pull/8973#issuecomment-145313370
Regarding the hierarchy, I think that we should have an AggregateFunction2
class with two subclasses, one to handle aggregates which can be implemented in
terms of expressions (basically, just rename AlgebraicAggregate) and another
for dealing with interpreted aggregates only (named something like
InterpretedAggregate).
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