Rich-T-kid opened a new pull request, #12207:
URL: https://github.com/apache/arrow-rs/pull/12207

   # Which issue does this PR close?
   
   - Part of #12205
   
   # Rationale for this change
   
   This benchmark works toward #12205 by establishing the current cost of 
writing a dictionary whose values array is much larger than the portion 
referenced by its keys.
   
   # What changes are included in this PR?
   
   Adds one focused IPC stream-writer benchmark with 8,192 keys that reference 
16 entries from a dictionary containing 65,536 values of 256 bytes each. The 
dictionary setup is outside the timed region.
   
   # Are these changes tested?
   
   The benchmark was compiled, linted, and run locally. On current main, one 
stream write measured approximately 220 microseconds.
   
   # Are there any significant user-facing changes?
   
   No.
   
   # AI usage disclosure
   
   Codex helped implement and validate the benchmark.


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