Github user mxm commented on the pull request:
https://github.com/apache/flink/pull/966#issuecomment-130324770
"Rich" does not refer to the number of methods but the fact that it has the
RuntimeContext available. All non-rich variants do not get state inserted. This
follows a naming convention in Flink. `AbstractInputFormat` might be a more
intuitive name for novices but I'm more inclined to naming consistency.
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