zhuliquan commented on PR #11455:
URL: https://github.com/apache/datafusion/pull/11455#issuecomment-2248130513
@alamb I thought a idea that we can attach lru-cache (key is regex, value is
result of compiled regex) to struct `RegexpLikeFunc`.
```rust
#[derive(Debug)]
pub struct RegexpLikeFunc {
lru_cache: LruCache<String, regex::Regex>,
signature: Signature,
}
impl Default for RegexpLikeFunc {
fn default() -> Self {
Self::new()
}
}
impl RegexpLikeFunc {
pub fn new() -> Self {
use DataType::*;
Self {
signature: Signature::one_of(
vec![
Exact(vec![Utf8, Utf8]),
Exact(vec![LargeUtf8, Utf8]),
Exact(vec![Utf8, Utf8, Utf8]),
Exact(vec![LargeUtf8, Utf8, Utf8]),
],
Volatility::Immutable,
),
lru_cache: LruCache::new(NonZeroUsize::new(1024).unwrap()),
}
}
}
```
We can use cache like way in `regexp_is_match_utf8`.
https://github.com/apache/arrow-rs/blob/af40ea382275dba967bfabc1632fded07d2129b9/arrow-string/src/regexp.rs#L50
https://github.com/apache/arrow-rs/blob/af40ea382275dba967bfabc1632fded07d2129b9/arrow-string/src/regexp.rs#L83-L95
it's make full use of result of compiled regex. and this way can be applied
for scalar or array two cases.
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