Github user StephanEwen commented on the issue:
https://github.com/apache/flink/pull/3186
Update: The first version had an issue with binary compatibility in the
Scala DataStream API:
This Scala API accidentally exposed in Flink 1.0 a public method with an
internal type as a parameter (an internal utility method). That should not have
been the case, since method cannot be guaranteed when a parameter is a
non-public type.
Unfortunately, the automatic tooling for binary compatibility checks is not
flexible enough to work around that: Exclusions for methods do not work if
parameter types were altered.
Due to that, the newer version rolls back the cleanup commit that renames
the internal `AggregateFunction`.
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