shrirangmhalgi commented on PR #55549:
URL: https://github.com/apache/spark/pull/55549#issuecomment-4372449446

   Hi @sarutak, thank you again for the review. That is a fair point. I see the 
distinction between implementation behavior and API guarantee, and agree that 
documenting order preservation would constrain future optimizations and be 
inconsistent with `array_union`, `array_intersect`, and `array_except`. 
   
   I'll close this PR as well. Thanks for the context on the design philosophy 
behind these functions.


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