tustvold commented on PR #5623:
URL: https://github.com/apache/arrow-rs/pull/5623#issuecomment-2107314085

   The check got moved to here - 
https://github.com/apache/arrow-rs/pull/5623/commits/a69cbac4466eb2967ff20d6b117d30e891596f6f#diff-7e118aa8aabb6fbbb2b5dcd508dd5b3219300bcb829c6cbef6cf35146320806aR209
   
   > Is there a benchmark? I'm wondering how much slower.
   
   No, but I would expect it to be quite significant. You are comparing the 
performance of a pointer indirection to a hashmap lookup. Given this check is 
done for every type in the array, I would expect it to be quite significant
   


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