lisancao commented on PR #59778:
URL: https://github.com/apache/spark/pull/59778#issuecomment-6648795773

   Thanks @holdenk! Rebased onto master, and removed the migration note in 
6fddee13206.
   
   Before I rework the check: the review bot suggests deciding the fallback on 
the executors, when the UDF runs, instead of on the driver while planning ([in 
its 
review](https://github.com/apache/spark/pull/59778#pullrequestreview-5720487728)).
 If we keep it on the driver, it's more aligned with classic and out of the 
shared execution path. Which would you prefer?
   
   If it stays on the driver, the check can go into a small module under 
`pyspark/sql/worker` and run through `PythonPlannerRunner`, like UDTF analyze 
and Python data sources, so it starts the same way as the workers and can fork 
from the daemon. It'll return a Boolean and throw errors for anything 
unexpected, as you suggested.
   
   UDTFs are purposely excluded from this PR for scope and will be in a 
follow-up (SPARK-60828).


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