goldigd05 commented on issue #48679:
URL: https://github.com/apache/arrow/issues/48679#issuecomment-3708374564

   Hi, I would like to help with this issue.
   
   I can reproduce the column ordering bug in `pivot_wider` when swapping the 
`on` and `index` parameters.
   My initial idea for a fix is:
   
   1. Ensure that the pivot keys are iterated in the same order as they appear 
in the original table.
   2. Optionally, provide a `sort_keys=False` parameter so users can preserve 
natural key order.
   3. Update unit tests to assert column ordering matches expectations (similar 
to Polars pivot output).
   
   I am happy to implement this in a PR once the approach is confirmed.


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