dongjoon-hyun commented on PR #59735:
URL: https://github.com/apache/spark/pull/59735#issuecomment-6366173116

   Thank you for checking the guard path. I'd like to keep 
`blockUnsupportedSqlCommandIn` unchanged in this PR. Its eager fallback is the 
known limitation that SPARK-57189 documented, and this PR only changes how 
`DefineFlow` transforms the relation of a flow. I added the shape to the PR 
description as a remaining limitation: if a flow function passes a 
further-transformed `spark.sql(..., df=...)` result as a DataFrame argument of 
another `spark.sql` call, that call still fails on the first run.
   


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