pitrou opened a new pull request, #47594: URL: https://github.com/apache/arrow/pull/47594
### Rationale for this change When passing the compression level to the zlib initiation method `deflateInit2`, we were actually passing it to the wrong parameter (the `memLevel` parameter). As a consequence, changing the zlib/gzip "compression level" in the Arrow APIs had little effect on actual compressed size. ### What changes are included in this PR? Pass compression level correctly. ### Are these changes tested? They are exercised by regular CI tests. In addition, I tested manually that changing the compression level now affects compressed size accordingly. ### Are there any user-facing changes? Yes, this fixes behavior so as to match the documented semantics. -- 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]
