Github user he-sk commented on the pull request:
https://github.com/apache/incubator-flink/pull/243#issuecomment-67155467
I think it would work. I just checked that a Java enum (i.e., the old
`Aggregations` class) can contain static methods and you can import them static
and call them just like there were defined in a normal class. I think that the
`Aggregations` class and possibly the old `AggregateOperator` are the only
user-facing classes. The different `AggregationFunction`s and the
`AggregationFunctionFactory` are only used internally and could be moved.
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