Github user mxm commented on the pull request:
https://github.com/apache/incubator-flink/pull/210#issuecomment-63449724
>Why didn't you implement these as an identity-(map)function and save the
information to unique accumulators (maybe identified by a user-supplied ID?
Thank you for your feedback. The idea is to have intermediate results
available to the user program within the execution of a Flink program.
Currently, this is only possible through RichFunction which provide access to
the RuntimeContext.
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