songwdfu commented on PR #16336:
URL: https://github.com/apache/pinot/pull/16336#issuecomment-3116538504
Some benchmarking results on combine only
```
Benchmark
(_limit) (_numRecordsPerSegment) (_numSegments) Mode Cnt Score
Error Units
BenchmarkPartitionedCombineGroupBy.concurrentIndexedTableForCombineGroupBy
500 1000 20 avgt 3 11586.333 ±
908.472 us/op
BenchmarkPartitionedCombineGroupBy.concurrentIndexedTableForCombineGroupBy
500 1000 50 avgt 3 30162.705 ±
2402.600 us/op
BenchmarkPartitionedCombineGroupBy.concurrentIndexedTableForCombineGroupBy
500 10000 20 avgt 3 98331.911 ±
100715.722 us/op
BenchmarkPartitionedCombineGroupBy.concurrentIndexedTableForCombineGroupBy
500 10000 50 avgt 3 263175.992 ±
219789.377 us/op
BenchmarkPartitionedCombineGroupBy.concurrentIndexedTableForCombineGroupBy
1000000000 1000 20 avgt 3 4055.460 ±
1290.144 us/op
BenchmarkPartitionedCombineGroupBy.concurrentIndexedTableForCombineGroupBy
1000000000 1000 50 avgt 3 12065.766 ±
3295.534 us/op
BenchmarkPartitionedCombineGroupBy.concurrentIndexedTableForCombineGroupBy
1000000000 10000 20 avgt 3 45512.496 ±
88171.888 us/op
BenchmarkPartitionedCombineGroupBy.concurrentIndexedTableForCombineGroupBy
1000000000 10000 50 avgt 3 153807.820 ±
119846.749 us/op
BenchmarkPartitionedCombineGroupBy.partitionedCombineGroupBy
500 1000 20 avgt 3 6840.583 ±
1535.600 us/op
BenchmarkPartitionedCombineGroupBy.partitionedCombineGroupBy
500 1000 50 avgt 3 21190.212 ±
469.841 us/op
BenchmarkPartitionedCombineGroupBy.partitionedCombineGroupBy
500 10000 20 avgt 3 92514.098 ±
14507.049 us/op
BenchmarkPartitionedCombineGroupBy.partitionedCombineGroupBy
500 10000 50 avgt 3 233490.829 ±
23362.847 us/op
BenchmarkPartitionedCombineGroupBy.partitionedCombineGroupBy
1000000000 1000 20 avgt 3 1577.627 ±
505.906 us/op
BenchmarkPartitionedCombineGroupBy.partitionedCombineGroupBy
1000000000 1000 50 avgt 3 4785.546 ±
2008.359 us/op
BenchmarkPartitionedCombineGroupBy.partitionedCombineGroupBy
1000000000 10000 20 avgt 3 29018.079 ±
56498.263 us/op
BenchmarkPartitionedCombineGroupBy.partitionedCombineGroupBy
1000000000 10000 50 avgt 3 101647.710 ±
237429.099 us/op
BenchmarkPartitionedCombineGroupBy.partitionedCombineGroupByJavaHashTable
500 1000 20 avgt 3 11338.989 ±
2738.736 us/op
BenchmarkPartitionedCombineGroupBy.partitionedCombineGroupByJavaHashTable
500 1000 50 avgt 3 43757.969 ±
3611.339 us/op
BenchmarkPartitionedCombineGroupBy.partitionedCombineGroupByJavaHashTable
500 10000 20 avgt 3 234184.462 ±
74388.652 us/op
BenchmarkPartitionedCombineGroupBy.partitionedCombineGroupByJavaHashTable
500 10000 50 avgt 3 698744.935 ±
725353.320 us/op
BenchmarkPartitionedCombineGroupBy.partitionedCombineGroupByJavaHashTable
1000000000 1000 20 avgt 3 1535.365 ±
263.556 us/op
BenchmarkPartitionedCombineGroupBy.partitionedCombineGroupByJavaHashTable
1000000000 1000 50 avgt 3 4729.024 ±
1665.627 us/op
BenchmarkPartitionedCombineGroupBy.partitionedCombineGroupByJavaHashTable
1000000000 10000 20 avgt 3 30640.425 ±
59502.875 us/op
BenchmarkPartitionedCombineGroupBy.partitionedCombineGroupByJavaHashTable
1000000000 10000 50 avgt 3 98894.031 ±
165724.282 us/op
```
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