Github user vasia commented on the pull request:
https://github.com/apache/flink/pull/818#issuecomment-112923172
Hi @shghatge!
For this issue, I think we should only add the `difference` method. If you
want to avoid duplicating code, you can always define a private helper method.
If we decide that we need overloaded public methods for additions and
removals, we should discuss this in a separate JIRA in my view.
Let me know if you have questions!
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