jasonyanwenl opened a new pull request #11241:
URL: https://github.com/apache/kafka/pull/11241


   Currently in both `KStreamMap` and `KStreamFlatMap` classes, they will throw 
NPE if the call to `KeyValueMapper#apply` return Null. We should check whether 
the result of that call is Null and throw a more meaningful error message for 
better debugging.
   
   Two unit tests are also added to check if we successfully captured the Null.
   
   ### Committer Checklist (excluded from commit message)
   - [ ] Verify design and implementation 
   - [ ] Verify test coverage and CI build status
   - [ ] Verify documentation (including upgrade notes)
   


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