viirya commented on code in PR #5235:
URL: https://github.com/apache/arrow-rs/pull/5235#discussion_r1435384693
##########
arrow-string/src/regexp.rs:
##########
@@ -216,15 +215,14 @@ pub fn regexp_match<OffsetSize: OffsetSizeTrait>(
(Some(value), Some(pattern)) => {
let existing_pattern = patterns.get(&pattern);
let re = match existing_pattern {
- Some(re) => re.clone(),
+ Some(re) => re,
None => {
let re = Regex::new(pattern.as_str()).map_err(|e| {
ArrowError::ComputeError(format!(
"Regular expression did not compile: {e:?}"
))
})?;
- patterns.insert(pattern, re.clone());
- re
+ patterns.entry(pattern).or_insert(re)
Review Comment:
Oh, the branch to eliminate is the one inside `or_insert`? Do you mean
something like:
```rust
let entry = patterns.entry(pattern.clone());
let re = match entry {
Entry::Occupied(entry) => entry.into_mut(),
Entry::Vacant(entry) => {
let re = Regex::new(pattern.as_str()).map_err(|e| {
ArrowError::ComputeError(format!(
"Regular expression did not compile: {e:?}"
))
})?;
entry.insert(re)
}
};
```
Hmm, it actually gets regression a little. 🤔
```
regexp time: [7.6891 ms 7.7210 ms 7.7511 ms]
change: [+14.792% +15.570% +16.321%] (p = 0.00 <
0.05)
Performance has regressed.
```
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