rootvector2 opened a new pull request, #631: URL: https://github.com/apache/commons-csv/pull/631
the reader overload of `printWithEscapes` rebuilt a string from the whole accumulated output on every character to run the delimiter look-ahead, so escaping a large `Reader` value with no escapable characters ran in `O(n^2)`. found while benchmarking `format.print(Reader, out, true)` in an escape format like `MYSQL`: a 0.8 MB field took ~28 s versus ~6 ms for the quoted path. the look-ahead only needs the current character and the peeked buffer, so `test` is built from those instead of the whole builder, which is the same match but linear (~19 ms at 0.8 MB). - [x] Read the [contribution guidelines](CONTRIBUTING.md) for this project. - [ ] Read the [ASF Generative Tooling Guidance](https://www.apache.org/legal/generative-tooling.html) if you use Artificial Intelligence (AI). - [ ] I used AI to create any part of, or all of, this pull request. Which AI tool was used to create this pull request, and to what extent did it contribute? - [x] Run a successful build using the default [Maven](https://maven.apache.org/) goal with `mvn`; that's `mvn` on the command line by itself. - [x] Write unit tests that match behavioral changes, where the tests fail if the changes to the runtime are not applied. This may not always be possible, but it is a best practice. - [x] Write a pull request description that is detailed enough to understand what the pull request does, how, and why. - [x] Each commit in the pull request should have a meaningful subject line and body. Note that a maintainer may squash commits during the merge process. -- 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: [email protected] For queries about this service, please contact Infrastructure at: [email protected]
