alamb commented on PR #7650:
URL: https://github.com/apache/arrow-rs/pull/7650#issuecomment-2984356370
Well, I got some of the performance back but I still can't explain why it is
10% slower. The only thing I can come up with is that the coalesce kernel is
slower due to allocations or something
```
group
alamb_faster_coalesce main
-----
--------------------- ----
filter: mixed_utf8, 8192, nulls: 0.1, selectivity: 0.001
1.09 96.2±0.63ms ? ?/sec 1.00 88.1±0.72ms ?
?/sec
filter: mixed_utf8view (max_string_len=128), 8192, nulls: 0.1, selectivity:
0.8 1.21 4.6±0.03ms ? ?/sec 1.00 3.9±0.02ms ?
?/sec
```
Maybe I can show that i can make up the difference with some other
optimization
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