Rachelint opened a new pull request, #26081:
URL: https://github.com/apache/datafusion/pull/26081

   ## Which issue does this PR close?
   
   None. Benchmark-only ablation for #25959; do not merge.
   
   ## Rationale for this change
   
   Measure whether the new Partial working-set policy retains its benefit when 
Final uses ordinary hash aggregation. The earlier requests on #25959 failed 
during checkout because the runner only fetched that PR history. This draft 
makes both experimental refs reachable.
   
   ## What changes are included in this PR?
   
   - `126109f50158b9dbb4e9fd13ce46d9520268b789`: old Partial policy from 
`cf6819d`, with Final bucketing disabled.
   - `70ac2eed7ad82bd0915ad526cd735bdcacbf7458`: new Partial policy from 
`efd384f`, with Final bucketing disabled.
   - The merge commit preserves the new variant tree and includes the baseline 
in its ancestry for the runner.
   - The only ablation change forces the Final constructor bucket threshold to 
zero; Partial still reads the experimental configuration. Original #25959 is 
unchanged.
   
   ## What is the testing strategy for this PR?
   
   Formatting and focused diff inspection passed. Two partitioned ClickBench 
comparisons: old versus new Partial with Final bucketing disabled on both 
sides; then complete `efd384f` versus new Partial without Final buckets. Shared 
threshold: 262144. No full test suite rerun for this experimental switch.
   
   ## Are there any user-facing changes?
   
   Experiment only, not intended for merge.


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