[GitHub] [spark] WeichenXu123 commented on pull request #40520: [SPARK-42896][SQL][PYSPARK] Make `mapInPandas` / `mapInArrow` support barrier mode execution

["WeichenXu123 (via GitHub)" <gi...@apache.org>]

WeichenXu123 commented on PR #40520:
URL: https://github.com/apache/spark/pull/40520#issuecomment-1480428307

   To address @HyukjinKwon 's concern about optimizer, 
   
   can we add `is_barrier` attribute into `UnaryExecNode`,
   and if optimizer find a node marking `is_barrier` as True, then skip all optimizations around the node.
   
   CC @cloud-fan @mengxr WDYT ?


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