should be it

external/duckdb/benchmark/micro/groupby-parallel/tiny_groups.benchmark

@@ -0,0 +1,25 @@
+# name: benchmark/micro/groupby-parallel/tiny_groups.benchmark
+# description: Aggregation with small group count
+# group: [groupby-parallel]
+
+name Grouped Aggregate (S, 100 groups)
+group aggregate
+subgroup parallel
+
+load
+create temporary table d as select mod(range, 100) g, 42 p from range(10000000);
+
+run
+select g, count(*), min(p), max(p) c from d group by g order by g limit 10;
+
+result IIII
+0	100000	42	42
+1	100000	42	42
+2	100000	42	42
+3	100000	42	42
+4	100000	42	42
+5	100000	42	42
+6	100000	42	42
+7	100000	42	42
+8	100000	42	42
+9	100000	42	42