alamb commented on pull request #8300:
URL: https://github.com/apache/arrow/pull/8300#issuecomment-706546221


   Sorry I don't have more time to spend on this -- I am still struggling to 
get my existing project code to compile against this branch and this PR is 
pretty massive to digest. 
   
   One other thing I found this morning is that the `TryClone` trait is still 
used in `ParquetWriter` so I do think it needs to be publically exported 
somehow (or we need to refactor the writer)
   
   I have also been trying to figure out if the `ParquetReader` trait is still 
needed after this refactoring.
   
   So I guess all in all my conclusion is that the ideas behind this PR are 
good but:
   1. It is hard to review given its size
   2. There will likely be a fairly substantial backwards incompatible change 
for anyone using the ParquetReader in their project


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