xudong963 commented on PR #27251:
URL: https://github.com/apache/datafusion/pull/27251#issuecomment-6737029132

   Thanks @matthewmturner, I found one correctness blocker: 
`struct_field_names_match` zips union children by storage order even though 
Arrow and DataFusion match them by type ID, which can both reject valid 
reordered unions and accept mismatched nested struct names.
   
   How about matching union children by type ID and adding focused unit 
coverage?


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