andygrove commented on pull request #33140:
URL: https://github.com/apache/spark/pull/33140#issuecomment-872683064


   > why does the final plan matter? are you going to change `df.collect` to 
leverage columnar execution as well?
   
   We have no plans currently to change `df.collect`. The main issue is that 
`AdaptiveSparkPlanExec` isn't always the final plan. It can be contained inside 
other plans. One example is when writing the results of an adaptive plan to 
Parquet and we want to avoid unnecessary columnar-to-row followed by 
row-to-columnar when doing the columnar write.
   
   


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