tustvold opened a new pull request, #4701:
URL: https://github.com/apache/arrow-rs/pull/4701

   # Which issue does this PR close?
   
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   Closes #4596 
   
   # Rationale for this change
    
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   Why are you proposing this change? If this is already explained clearly in 
the issue then this section is not needed.
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   Adds datum based comparison kernels, deprecating the old kernels and 
drastically reducing the amount of generated code.
   
   Benchmarks show no major performance regressions, and if anything 
non-trivial performance improvements.
   
   Additionally a release build on master with dyn_cmp_dict takes
   
   ```
   ________________________________________________________
   Executed in   39.60 secs    fish           external
      usr time  128.19 secs  583.00 micros  128.19 secs
      sys time    2.71 secs  102.00 micros    2.71 secs
   ``` 
   
   But with the changes in this PR takes
   
   ```
   ________________________________________________________
   Executed in   15.87 secs    fish           external
      usr time   60.84 secs    0.00 micros   60.84 secs
      sys time    2.28 secs  643.00 micros    2.28 secs
   
   ```
   
   # What changes are included in this PR?
   
   <!--
   There is no need to duplicate the description in the issue here but it is 
sometimes worth providing a summary of the individual changes in this PR.
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   # Are there any user-facing changes?
   
   
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updated before approving the PR.
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   <!---
   If there are any breaking changes to public APIs, please add the `breaking 
change` label.
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