jhorstmann commented on issue #1400:
URL: https://github.com/apache/arrow-rs/issues/1400#issuecomment-1059762317
Good point, I tried some other variations and it seems to come down to the
handling of references vs copying. The following two variations lead to
different code:
```
pub fn min_reduce_ref(array: &[f64]) -> Option<f64> {
array.iter().reduce(|a, b| if cmp(a, b) { b } else { a }).copied()
}
pub fn min_reduce_copied(array: &[f64]) -> Option<f64> {
array.iter().copied().reduce(|a, b| if cmp(a, b) { b } else { a })
}
```
The second one generates the same code that I saw for `fold` earlier. In
theory it should be possible that both get optimized to the same code and this
might be limitation in LLVM.
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