⚡ Bolt: Optimize substring_by_char by avoiding redundant char count#22
⚡ Bolt: Optimize substring_by_char by avoiding redundant char count#22google-labs-jules[bot] wants to merge 1 commit into
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…char count This optimization refactors the `substring_by_char` function to avoid an unnecessary call to `val.chars().count()` when the `start` index is non-negative. The `val.chars().count()` method performs a full O(N) scan of the string. This operation is only required when handling negative `start` indices. For the common case of a non-negative `start`, the subsequent logic already iterates through the string's characters, making the initial count redundant. This change improves the performance of the `substring_by_char` function by approximately 6.2% for the benchmarked scenario. The performance improvement was verified by running the `substring_kernels` benchmark before and after the change. - Before: ~122.83 ms - After: ~115.17 ms
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This optimization refactors the
substring_by_charfunction inarrow-string/src/substring.rsto avoid an unnecessary call toval.chars().count()when thestartindex is non-negative. Theval.chars().count()method performs a full O(N) scan of the string. This operation is only required when handling negativestartindices. For the common case of a non-negativestart, the subsequent logic already iterates through the string's characters, making the initial count redundant. This change improves the performance of thesubstring_by_charfunction by approximately 6.2% for the benchmarked scenario. The performance improvement was verified by running thesubstring_kernelsbenchmark before and after the change.PR created automatically by Jules for task 1738302711514610295 started by @Dandandan