HippoBaro commented on PR #11278:
URL: https://github.com/apache/arrow-rs/pull/11278#issuecomment-5973275357

   > after reading the issue and the PR descrtion I think this PR can be split 
into two seperate PR that target the ree & dictionary changes indepently.
   
   @Rich-T-kid I kept these together because the dictionary and REE fixes 
overlap heavily in the same schema normalization, compatibility checks, and 
level-generation code. They also interact directly: we need to handle both 
`Dictionary<REE<T>>` and `REE<Dictionary<T>>` consistently, especially around 
nullability.
   
   They could be separated, but a clean split would be a closely coupled pair 
of PRs where one introduces shared machinery that the other builds on, which I 
usually try to avoid since it makes reviewing more difficult. WDYT? 


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