pitrou commented on PR #39403:
URL: https://github.com/apache/arrow/pull/39403#issuecomment-1932086310
However, it seems that another micro-benchmark becomes slightly faster:
* before:
```
---------------------------------------------------------------------------------------------------------
Benchmark Time CPU
Iterations UserCounters...
---------------------------------------------------------------------------------------------------------
BM_DefinitionLevelsToBitmapRepeatedAllMissing 2394 ns 2394 ns
289688 bytes_per_second=815.98Mi/s
BM_DefinitionLevelsToBitmapRepeatedAllPresent 4292 ns 4291 ns
163130 bytes_per_second=455.15Mi/s
BM_DefinitionLevelsToBitmapRepeatedMostPresent 4191 ns 4191 ns
167253 bytes_per_second=466.054Mi/s
```
* after:
```
---------------------------------------------------------------------------------------------------------
Benchmark Time CPU
Iterations UserCounters...
---------------------------------------------------------------------------------------------------------
BM_DefinitionLevelsToBitmapRepeatedAllMissing 2312 ns 2311 ns
303845 bytes_per_second=845.034Mi/s
BM_DefinitionLevelsToBitmapRepeatedAllPresent 4110 ns 4109 ns
170384 bytes_per_second=475.335Mi/s
BM_DefinitionLevelsToBitmapRepeatedMostPresent 4049 ns 4048 ns
173085 bytes_per_second=482.458Mi/s
```
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