Github user StephanEwen commented on the pull request:
https://github.com/apache/flink/pull/966#issuecomment-127032323
Would not not be much simpler to add an interface `RuntimeContextFormat`
with a method (`setRuntimeContext()`) and call this method on the formats that
implement this interface? That would be three changed classes, done.
I am also a bit sceptical about the difference between input format and
rich input format. For transformation functions the difference between Function
(a lambda) and RichFunction (many mode methods) makes sense. Input formats are
per-se pretty rich...
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