Omega359 commented on PR #14653:
URL: https://github.com/apache/datafusion/pull/14653#issuecomment-2661642119

   I've made some changes locally where I test to see if the existing plan is a 
projection but I realized that I can't just rely on that either as the plan 
could possibly have been manually made then a DataFrame wrapped around it and 
the with_column function called.
   
   For my approach to work I would need a way to strongly guarantee that the 
last projection that was made was done via the project(..) function in the 
builder where the normalization/columnization is guaranteed to have happened. 
I'm not sure right now how to do that


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