yeshengm opened a new pull request #25266: [SPARK-28530][SQL] Cost-based join 
reorder optimizer batch should be FixedPoint(1)
URL: https://github.com/apache/spark/pull/25266
 
 
   ## What changes were proposed in this pull request?
   Since for AQP the cost for joins can change between multiple runs, there is 
no reason that we have an idempotence enforcement on this optimizer batch. We 
thus make it `FixedPoint(1)` instead of `Once`.
   
   ## How was this patch tested?
   Existing UTs.
   

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