pitrou commented on PR #43661:
URL: https://github.com/apache/arrow/pull/43661#issuecomment-3512163522

   Ok, I think this is approaching the problem from the wrong end.
   
   1. We should fix the issue in `CastBinaryToBinaryOffsets` so that the O(N^2) 
behavior cannot occur anymore
   2. Also, we are now able to read Parquet [directly as 
LargeString](https://github.com/apache/arrow/pull/46532), so the intermediate 
cast is not required anymore
   


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