bryanck commented on PR #18336:
URL: https://github.com/apache/iceberg/pull/18336#issuecomment-5934101766

   This PR should address an unresolved concern raised in 
https://github.com/apache/iceberg/pull/12634 by @rdblue .
   
   My thought about the concern is that if a struct without children is passed 
into the struct prune method, then it is safe to assume this is an empty struct 
rather than the full struct. This is consistent with `TypeUtil.project()` for 
example (though different than `TypeUtil.select()`).
   
   At the very least we should add a comment similar to the one for 
`TypeUtil.project()`.


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