viirya commented on code in PR #19532:
URL: https://github.com/apache/datafusion/pull/19532#discussion_r2650365169
##########
datafusion/common/src/utils/mod.rs:
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@@ -741,6 +741,43 @@ pub mod datafusion_strsim {
generic_levenshtein(&StringWrapper(a), &StringWrapper(b))
}
+ /// Calculates the Levenshtein distance using a reusable cache buffer.
+ /// This avoids allocating a new Vec for each call, improving performance
+ /// when computing many distances.
+ ///
+ /// The `cache` buffer will be resized as needed and reused across calls.
+ pub fn levenshtein_with_buffer(a: &str, b: &str, cache: &mut Vec<usize>)
-> usize {
Review Comment:
Okay, I refactored it to `generic_levenshtein_with_buffer`. Now
`generic_levenshtein` calls it.
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