tustvold opened a new pull request, #3621:
URL: https://github.com/apache/arrow-rs/pull/3621

   # Which issue does this PR close?
   
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   In theory the idea of using the slices iterator is that LLVM is able to 
vectorise the inner iteration, in practice because the operation is fallible, 
it fails to do so. As a result this special case is just resulting in 
additional codegen and is actually marginally slower.
   
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