pitrou commented on PR #55323:
URL: https://github.com/apache/arrow/pull/55323#issuecomment-6634258888
Benchmark numbers on my AMD Zen 2 CPU:
* before:
```
---------------------------------------------------------------------------------------------------------
Benchmark Time CPU
Iterations UserCounters...
---------------------------------------------------------------------------------------------------------
BM_DefinitionLevelsToBitmapRepeatedAllMissing 2272 ns 2271 ns
124061 bytes_per_second=860.028Mi/s
BM_DefinitionLevelsToBitmapRepeatedAllPresent 2373 ns 2372 ns
117807 bytes_per_second=823.555Mi/s
BM_DefinitionLevelsToBitmapRepeatedMostPresent 2806 ns 2806 ns
98122 bytes_per_second=696.15Mi/s
BM_FindMinMax/7 6.27 ns 6.26 ns
44832223 bytes_per_second=2.08172Gi/s items_per_second=1.11761G/s
BM_FindMinMax/1024 26.5 ns 26.5 ns
10523802 bytes_per_second=72.051Gi/s items_per_second=38.6821G/s
BM_FindMinMax/2047 65.1 ns 65.1 ns
4275522 bytes_per_second=58.6112Gi/s items_per_second=31.4667G/s
BM_FindMinMax/2048 56.6 ns 56.5 ns
4991379 bytes_per_second=67.4677Gi/s items_per_second=36.2214G/s
```
* after:
```
---------------------------------------------------------------------------------------------------------
Benchmark Time CPU
Iterations UserCounters...
---------------------------------------------------------------------------------------------------------
BM_DefinitionLevelsToBitmapRepeatedAllMissing 815 ns 815 ns
344383 bytes_per_second=2.34094Gi/s
BM_DefinitionLevelsToBitmapRepeatedAllPresent 927 ns 926 ns
298994 bytes_per_second=2.0588Gi/s
BM_DefinitionLevelsToBitmapRepeatedMostPresent 1361 ns 1361 ns
205652 bytes_per_second=1.40163Gi/s
BM_FindMinMax/7 6.39 ns 6.39 ns
43627315 bytes_per_second=2.04008Gi/s items_per_second=1.09526G/s
BM_FindMinMax/1024 27.0 ns 27.0 ns
10367461 bytes_per_second=70.6521Gi/s items_per_second=37.931G/s
BM_FindMinMax/2047 67.0 ns 66.9 ns
4180494 bytes_per_second=56.9505Gi/s items_per_second=30.5751G/s
BM_FindMinMax/2048 57.6 ns 57.6 ns
4810381 bytes_per_second=66.2131Gi/s items_per_second=35.5479G/s
```
Neat improvement!
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