comphead commented on code in PR #20496:
URL: https://github.com/apache/datafusion/pull/20496#discussion_r2842320332


##########
datafusion/core/benches/aggregate_query_sql.rs:
##########
@@ -251,6 +251,39 @@ fn criterion_benchmark(c: &mut Criterion) {
             )
         })
     });
+
+    c.bench_function("array_agg_query_group_by_few_groups", |b| {

Review Comment:
   please help me to understand what are narrow, mid, wide groups? is this how 
data distributed, the amount of groups? 



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