neilconway commented on PR #20504:
URL: https://github.com/apache/datafusion/pull/20504#issuecomment-3946786309

   Benchmarks:
   
   ```
   group                                   array-agg-opt                        
  array-agg-vanilla
   -----                                   -------------                        
  -----------------
   array_agg_query_group_by_few_groups     1.04    632.3±5.29µs        ? ?/sec  
  1.00    609.2±5.90µs        ? ?/sec
   array_agg_query_group_by_many_groups    1.00      2.2±0.03ms        ? ?/sec  
  12.15    26.6±0.39ms        ? ?/sec
   array_agg_query_group_by_mid_groups     1.00  1104.0±12.85µs        ? ?/sec  
  3.32      3.7±0.02ms        ? ?/sec
   ```


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