vegarsti commented on code in PR #18424:
URL: https://github.com/apache/datafusion/pull/18424#discussion_r2487758392


##########
datafusion/functions-nested/src/reverse.rs:
##########
@@ -183,6 +196,50 @@ fn general_array_reverse<O: OffsetSizeTrait + 
TryFrom<i64>>(
     )?))
 }
 
+fn list_view_reverse<O: OffsetSizeTrait + TryFrom<i64>>(

Review Comment:
   Alright, I tried the benchmark here #18425 with `array_len` of 10k (it's 
100k on the branch), using MutableData is way worse 🫨  Baseline is the code on 
this PR, the code from this snippet is 
[here](https://gist.github.com/vegarsti/28be107e53670428750874bfc0cdb621).
   
   ```
   array_reverse           time:   [44.858 µs 44.865 µs 44.874 µs]
                           change: [+545.75% +547.46% +549.17%] (p = 0.00 < 
0.05)
                           Performance has regressed.
   ```
   
   



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