yew1eb commented on PR #1620:
URL: https://github.com/apache/auron/pull/1620#issuecomment-3515811507

   > 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!
   


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