[GitHub] [spark] LuciferYang commented on pull request #29871: [SPARK-32995][SQL] CostBasedJoinReorder optimizer rule should be idempotent

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LuciferYang commented on pull request #29871:
URL: https://github.com/apache/spark/pull/29871#issuecomment-699574633


   If there are multiple candidate plans with the same cost, I think `different 
inputs produce different outputs` is reasonable，so only need ensure the same 
behavior in Scala 2.12 and Scala 2.13


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