Tartarus0zm commented on PR #1620:
URL: https://github.com/apache/auron/pull/1620#issuecomment-3516029611

   > > Thank you for your contribution. You can add a test to verify whether 
cases like `NativeShuffleExchangeExec.write` have been fixed.
   > 
   > @Tartarus0zm A direct test for `NativeShuffleExchangeExec.write` is ideal 
but hard to reproduce in unit tests — the local Spark cluster runs driver and 
executor in the same JVM, so static objects like `AuronAdaptor.getInstance()` 
are initialized early during driver planning, preventing the executor-side null 
→ NPE failure seen in #1602. We added test units to ensure getInstance() never 
returns null. I also deployed the fix to production and re-ran the same SQL — 
the NoClassDefFoundError no longer occurs.
   > 
   > Any suggestions for a stronger test? Happy to improve if there's a better 
approach!
   
   @yew1eb  Thank you for your clarification.  
   @merrily01 @richox  Should we establish a CI environment with a driver and 
executor separated to detect such issues earlier?
   


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