etseidl commented on PR #11262:
URL: https://github.com/apache/arrow-rs/pull/11262#issuecomment-5956995188

   Sorry @HippoBaro, I've been too consumed with my footer adventures to loop 
back to this.
   
   As to the compatibility question, in the past when we've been in the wrong 
on the encoding side, we've been very conservative on the read side. If 
possible, it would be nice to be able to read both forms, but only write the 
correct one moving forward. We'd want to document in the code why both read 
paths are allowed, and maybe note in the docs that for compatibility reasons 
we'll accept the broken files, but that support may eventually go away.
   
   If it's not really feasible to support two read paths, then I'm not sure 
what to do. We really shouldn't keep writing non-conforming files, but what's a 
viable migration path for people that already have them?


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