alamb commented on PR #9276:
URL: 
https://github.com/apache/arrow-datafusion/pull/9276#issuecomment-1956037382

   > > Thanks @devinjdangelo -- I don't fully understand what problem this PR 
is fixing. Is this fixing wrong results? Or a panic? Or something else 🤔
   > > Could you possibly add a new test (rather than modify the existing one) 
so it is clearer?
   > 
   > Apologies for not properly documenting the issue up front. I created #9290 
to document the incorrect behavior that this PR is fixing. Essentially, 
ListingTables enforced a particular ordering on the columns which Copy alone 
does not. The logic for eliminating the partition columns from the 
`RecordBatches` to be written to disk needed to updated now that it cannot rely 
on the fixed column ordering.
   > 
   > I also restored the original test and added a new one instead of modifying.
   
   Thank you so much -- I am sorry for not being able to see it immediately. I 
struggle these days to keep up with everthing going on and don't seem to have 
the ability to research things as much as I would like to 


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