pitrou commented on PR #41036:
URL: https://github.com/apache/arrow/pull/41036#issuecomment-2049898830
I find it interesting that some benchmark variations fall to abysmal speeds,
for example for {int32, int64}:
```
GrouperWithMultiTypes/"{int32, int64}"/1024/100
12616 us 12614 us 55
items_per_second=81.1817k/s null_percent=1 size=1.024k
GrouperWithMultiTypes/"{int32, int64}"/1024/10
89235 us 89216 us 8
items_per_second=11.4778k/s null_percent=10 size=1.024k
GrouperWithMultiTypes/"{int32, int64}"/1024/2
279436 us 279381 us 2
items_per_second=3.66524k/s null_percent=50 size=1.024k
```
but not the same benchmark for {int32, int32}:
```
GrouperWithMultiTypes/"{int32, int32}"/1024/100
2020 us 2019 us 344
items_per_second=507.07k/s null_percent=1 size=1.024k
GrouperWithMultiTypes/"{int32, int32}"/1024/10
2114 us 2114 us 331
items_per_second=484.407k/s null_percent=10 size=1.024k
GrouperWithMultiTypes/"{int32, int32}"/1024/2
2318 us 2317 us 303
items_per_second=441.867k/s null_percent=50 size=1.024k
```
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