vladimirg-db opened a new pull request, #46082: URL: https://github.com/apache/spark/pull/46082
### What changes were proposed in this pull request? Added hand-crafted implementations of unicode-aware lower-case `contains`, `startsWith`, `endsWith` to optimize UTF8_BINARY_LCASE for ASCII-only strings. ### Why are the changes needed? `UTF8String.toLowerCase()`, which is used for the aforementioned collation-aware functions, has an optimization for full-ascii strings, but still always allocates a new object. In this PR I introduced loop-based implementations, which fall-back to `toLowerCase()` in case they meet a non-asci character. ### Does this PR introduce _any_ user-facing change? No ### How was this patch tested? Added new tests to `org.apache.spark.unsafe.types.CollationSupportSuite` and `org.apache.spark.unsafe.types.UTF8StringSuite` ### Was this patch authored or co-authored using generative AI tooling? No -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: reviews-unsubscr...@spark.apache.org For queries about this service, please contact Infrastructure at: us...@infra.apache.org --------------------------------------------------------------------- To unsubscribe, e-mail: reviews-unsubscr...@spark.apache.org For additional commands, e-mail: reviews-h...@spark.apache.org
