vegarsti commented on issue #8840:
URL: https://github.com/apache/arrow-rs/issues/8840#issuecomment-3531212384

   Agree that this seems like a legitimate bug. The nullability going from 
false to true when the field exists on both schemas works as expected
   
https://github.com/apache/arrow-rs/blob/2bc269c3eec23f6794fcd793b641ea4c08325d54/arrow-schema/src/schema.rs#L1330
   
   In `try_merge` we simply iterate over all the schemas and merge each field:
   
   
https://github.com/apache/arrow-rs/blob/2bc269c3eec23f6794fcd793b641ea4c08325d54/arrow-schema/src/schema.rs#L295-L319
   
   Might there be existing use cases where this behavior is a feature and not a 
bug?


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