qinghui-xu commented on issue #15313:
URL: https://github.com/apache/iceberg/issues/15313#issuecomment-4143450594

   Hello @mukund-thakur 
   Thanks for looking into this. Maybe my initial description was not clear 
enough. But as I explained in my 
[PR](https://github.com/apache/iceberg/pull/15560#issuecomment-4124454437), I 
was comparing the `Schema` and trying to drop some stale fields, and in the 
case of map fields, both map field and its children ("key" + "value") are 
dropped altogher. I agree that the map key as a field should be immutable, as 
what the spec says. But in the case of dropping map field, I feel it's legit to 
be able drop "key" and "value" fields explicitly as well.


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