dyno opened a new pull request, #14383:
URL: https://github.com/apache/iceberg/pull/14383

   when rewrite to a different spec, if there is only one small file unless 
rewrite-all, this file won't be able to rewrite if it does not also it won't 
meet any other criteria. 
   - enoughInputFiles
   - enoughContent
   but when write to a different spec, we do want the spec align with the 
storage layout. so it's better check this situation and rewrite the file.
   
   this specifically addressed an issue when we do in-table rollup to rewrite 
files to a coarser partition. in this case we don't want to rewrite-all but 
also think it's better to make the output file path align with the spec.


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