AdamGS commented on PR #21219:
URL: https://github.com/apache/datafusion/pull/21219#issuecomment-4148649777
Locally, the perf impact on the stats_merge benchmark are:
```
stats_merge/try_merge_iter/10parts_1cols
time: [261.85 ns 263.02 ns 264.27 ns]
change: [−20.578% −20.212% −19.831%] (p = 0.00 <
0.05)
Performance has improved.
Benchmarking stats_merge/try_merge_iter/10parts_5cols: Collecting 100
samples in estimatedstats_merge/try_merge_iter/10parts_5cols
time: [1.1278 µs 1.1310 µs 1.1346 µs]
change: [−18.151% −17.782% −17.421%] (p = 0.00 <
0.05)
Performance has improved.
Found 9 outliers among 100 measurements (9.00%)
3 (3.00%) high mild
6 (6.00%) high severe
Benchmarking stats_merge/try_merge_iter/10parts_20cols: Collecting 100
samples in estimatestats_merge/try_merge_iter/10parts_20cols
time: [4.1735 µs 4.1785 µs 4.1843 µs]
change: [−18.384% −18.204% −18.034%] (p = 0.00 <
0.05)
Performance has improved.
Found 8 outliers among 100 measurements (8.00%)
3 (3.00%) high mild
5 (5.00%) high severe
Benchmarking stats_merge/try_merge_iter/100parts_1cols: Collecting 100
samples in estimatestats_merge/try_merge_iter/100parts_1cols
time: [2.2418 µs 2.2478 µs 2.2547 µs]
change: [−22.768% −22.464% −22.154%] (p = 0.00 <
0.05)
Performance has improved.
Found 10 outliers among 100 measurements (10.00%)
6 (6.00%) high mild
4 (4.00%) high severe
Benchmarking stats_merge/try_merge_iter/100parts_5cols: Collecting 100
samples in estimatestats_merge/try_merge_iter/100parts_5cols
time: [11.596 µs 11.628 µs 11.665 µs]
change: [−14.560% −14.268% −13.925%] (p = 0.00 <
0.05)
Performance has improved.
Found 2 outliers among 100 measurements (2.00%)
1 (1.00%) high mild
1 (1.00%) high severe
Benchmarking stats_merge/try_merge_iter/100parts_20cols: Collecting 100
samples in estimatstats_merge/try_merge_iter/100parts_20cols
time: [43.707 µs 43.818 µs 43.949 µs]
change: [−16.318% −16.016% −15.691%] (p = 0.00 <
0.05)
Performance has improved.
Found 3 outliers among 100 measurements (3.00%)
1 (1.00%) high mild
2 (2.00%) high severe
Benchmarking stats_merge/try_merge_iter/500parts_1cols: Collecting 100
samples in estimatestats_merge/try_merge_iter/500parts_1cols
time: [11.530 µs 11.559 µs 11.591 µs]
change: [−23.035% −22.749% −22.473%] (p = 0.00 <
0.05)
Performance has improved.
Found 6 outliers among 100 measurements (6.00%)
5 (5.00%) high mild
1 (1.00%) high severe
Benchmarking stats_merge/try_merge_iter/500parts_5cols: Collecting 100
samples in estimatestats_merge/try_merge_iter/500parts_5cols
time: [57.852 µs 58.011 µs 58.178 µs]
change: [−15.960% −15.588% −15.191%] (p = 0.00 <
0.05)
Performance has improved.
Found 7 outliers among 100 measurements (7.00%)
5 (5.00%) high mild
2 (2.00%) high severe
Benchmarking stats_merge/try_merge_iter/500parts_20cols: Collecting 100
samples in estimatstats_merge/try_merge_iter/500parts_20cols
time: [220.48 µs 221.23 µs 222.16 µs]
change: [−13.692% −13.092% −12.313%] (p = 0.00 <
0.05)
Performance has improved.
Found 3 outliers among 100 measurements (3.00%)
1 (1.00%) high mild
2 (2.00%) high severe
```
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