wesm commented on pull request #7143:
URL: https://github.com/apache/arrow/pull/7143#issuecomment-647699240
Here's with clang, even less of an issue there it seems
```
benchmark baseline contender
change % regression
32 BM_ReadColumn<true,Int32Type>/1/1 1.656 GiB/sec 2.689 GiB/sec
62.384 False
15 BM_ReadColumn<true,Int64Type>/99/0 2.861 GiB/sec 4.184 GiB/sec
46.245 False
21 BM_ReadColumn<true,Int32Type>/99/50 1.890 GiB/sec 2.744 GiB/sec
45.220 False
20 BM_ReadColumn<true,Int64Type>/99/50 2.898 GiB/sec 4.199 GiB/sec
44.891 False
6 BM_ReadColumn<true,Int64Type>/50/1 1.530 GiB/sec 2.210 GiB/sec
44.402 False
30 BM_ReadColumn<true,Int64Type>/50/50 1.586 GiB/sec 2.233 GiB/sec
40.787 False
28 BM_ReadColumn<true,Int32Type>/50/0 881.102 MiB/sec 1.196 GiB/sec
39.025 False
22 BM_ReadColumn<true,Int64Type>/45/25 1.598 GiB/sec 2.221 GiB/sec
38.951 False
14 BM_ReadColumn<true,Int64Type>/1/1 2.967 GiB/sec 4.122 GiB/sec
38.919 False
29 BM_ReadColumn<true,Int32Type>/50/50 887.206 MiB/sec 1.203 GiB/sec
38.854 False
35 BM_ReadColumn<true,Int32Type>/99/0 1.928 GiB/sec 2.661 GiB/sec
38.045 False
17 BM_ReadColumn<true,Int64Type>/35/10 1.656 GiB/sec 2.248 GiB/sec
35.689 False
0 BM_ReadColumn<false,Int32Type>/-1/50 2.765 GiB/sec 3.750 GiB/sec
35.628 False
26 BM_ReadColumn<true,Int64Type>/30/10 1.692 GiB/sec 2.221 GiB/sec
31.244 False
19 BM_ReadColumn<true,Int64Type>/75/1 1.712 GiB/sec 2.217 GiB/sec
29.505 False
2 BM_ReadColumn<true,Int32Type>/25/5 991.022 MiB/sec 1.229 GiB/sec
27.031 False
31 BM_ReadColumn<true,Int64Type>/25/10 1.744 GiB/sec 2.164 GiB/sec
24.091 False
16 BM_ReadColumn<false,Int64Type>/-1/50 5.892 GiB/sec 7.252 GiB/sec
23.084 False
24 BM_ReadColumn<true,Int32Type>/10/10 1.003 GiB/sec 1.225 GiB/sec
22.073 False
23 BM_ReadColumn<true,DoubleType>/25/25 1.790 GiB/sec 2.159 GiB/sec
20.659 False
10 BM_ReadColumn<true,Int64Type>/5/5 1.995 GiB/sec 2.371 GiB/sec
18.853 False
5 BM_ReadColumn<true,Int64Type>/10/5 1.796 GiB/sec 2.122 GiB/sec
18.128 False
3 BM_ReadColumn<false,DoubleType>/-1/20 3.488 GiB/sec 4.062 GiB/sec
16.453 False
1 BM_ReadColumn<false,Int64Type>/-1/10 2.740 GiB/sec 3.055 GiB/sec
11.497 False
11 BM_ReadColumn<false,Int32Type>/-1/10 1.362 GiB/sec 1.486 GiB/sec
9.086 False
9 BM_ReadColumn<false,DoubleType>/-1/0 12.984 GiB/sec 13.310 GiB/sec
2.509 False
13 BM_ReadColumn<true,BooleanType>/5/10 515.781 MiB/sec 523.838 MiB/sec
1.562 False
7 BM_ReadColumn<false,Int32Type>/-1/1 4.505 GiB/sec 4.559 GiB/sec
1.198 False
34 BM_ReadColumn<false,BooleanType>/1/20 400.254 MiB/sec 403.780 MiB/sec
0.881 False
25 BM_ReadColumn<false,BooleanType>/-1/0 870.109 MiB/sec 875.827 MiB/sec
0.657 False
18 BM_ReadColumn<false,Int64Type>/-1/1 8.237 GiB/sec 8.045 GiB/sec
-2.331 False
27 BM_ReadColumn<true,BooleanType>/-1/1 816.651 MiB/sec 793.763 MiB/sec
-2.803 False
8 BM_ReadColumn<true,DoubleType>/10/50 1.649 GiB/sec 1.587 GiB/sec
-3.792 False
12 BM_ReadColumn<true,Int64Type>/-1/0 3.044 GiB/sec 1.432 GiB/sec
-52.958 True
33 BM_ReadColumn<true,DoubleType>/-1/0 3.161 GiB/sec 1.479 GiB/sec
-53.209 True
4 BM_ReadColumn<true,Int32Type>/-1/0 1.863 GiB/sec 754.619 MiB/sec
-60.448 True
```
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