StephanEwen commented on issue #6724: [FLINK-10380] Add precondition for assignToKeyGroup method URL: https://github.com/apache/flink/pull/6724#issuecomment-424788457 Concerning the other method you mentioned: That one is never used on the critical path, so things may be different there. Catching the null value earlier may be a more clean fix even. But again, we should not introduce branches if avoidable.
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