scovich commented on PR #9272:
URL: https://github.com/apache/arrow-rs/pull/9272#issuecomment-3848273734

   I just encountered (+ remembered) another use case for custom JSON decoding: 
Wrong-named fields. Whether due to schema evolution or flat-out typos, it may 
be desirable for multiple input field names to map to the same output field 
(with some precedence rules if multiple candidates are available). 
   
   Just lodging that thought here for now -- I didn't have time to see if the 
approach explored here can actually handle the use case.


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