kpihlblad commented on PR #21003:
URL: https://github.com/apache/kafka/pull/21003#issuecomment-6132483139

   Looking into this and it seems as when  
`__enable.process.processValue.fix__` is off, `KStream.process()` may break 
either silently or with an exception.
   
   - `selectKey().toTable().toStream().process().toTable()` throws `Found a 
null keyChangingChild node` at `build()`.
   - A key-changing `process()` in a sibling branch loses its repartition. No 
error.
   
   https://github.com/kpihlblad/kafka-streams-process-optimizer-bug
   
   Is this still planned for 4.5.0? I can help with tests or a rebase. I'll 
file a bug but right now my Apache Jira account seem to be locked :-)


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