Rich-T-kid opened a new pull request, #12054:
URL: https://github.com/apache/arrow-rs/pull/12054

   # Which issue does this PR close?
   
   Part of #11885. Benchmark coverage for #12008.
   
   # Why is this change needed?
   
   #12008 uses 16 dictionary values per selected key as the cutoff between 
dense and sparse key mappings. The existing benchmarks do not sweep that 
boundary, which makes it hard to tell whether the cutoff is right or too 
conservative.
   
   # What changes are included in this PR?
   
   Adds `concatenate_kernel` cases for 12 distinct dictionaries, each sliced to 
682 keys, with 4, 8, 12, 16, 20, 24, 32, and 64 values per selected key.
   
   # Are these changes tested?
   
   Built and ran all new `str_dict_slice` cases. Formatting, workspace Clippy 
with all targets and features, and typos pass.
   
   # Are there any significant user-facing changes?
   
   No. This only adds benchmark coverage.


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