dependabot[bot] opened a new pull request, #482: URL: https://github.com/apache/arrow-datafusion-python/pull/482
Bumps [regex-syntax](https://github.com/rust-lang/regex) from 0.7.4 to 0.7.5. <details> <summary>Changelog</summary> <p><em>Sourced from <a href="https://github.com/rust-lang/regex/blob/master/CHANGELOG.md";>regex-syntax's changelog</a>.</em></p> <blockquote> <h1>1.9.5 (2023-09-02)</h1> <p>This is a patch release that hopefully mostly fixes a performance bug that occurs when sharing a regex across multiple threads.</p> <p>Issue <a href="https://redirect.github.com/rust-lang/regex/issues/934";>#934</a> explains this in more detail. It is <a href="https://docs.rs/regex/latest/regex/#sharing-a-regex-across-threads-can-result-in-contention";>also noted in the crate documentation</a>. The bug can appear when sharing a regex across multiple threads simultaneously, as might be the case when using a regex from a <code>OnceLock</code>, <code>lazy_static</code> or similar primitive. Usually high contention only results when using many threads to execute searches on small haystacks.</p> <p>One can avoid the contention problem entirely through one of two methods. The first is to use lower level APIs from <code>regex-automata</code> that require passing state explicitly, such as <a href="https://docs.rs/regex-automata/latest/regex_automata/meta/struct.Regex.html#method.search_with";><code>meta::Regex::search_with</code></a>. The second is to clone a regex and send it to other threads explicitly. This will not use any additional memory usage compared to sharing the regex. The only downside of this approach is that it may be less convenient, for example, it won't work with things like <code>OnceLock</code> or <code>lazy_static</code> or <code>once_cell</code>.</p> <p>With that said, as of this release, the contention performance problems have been greatly reduced. This was achieved by changing the free-list so that it was sharded across threads, and that ensuring each sharded mutex occupies a single cache line to mitigate false sharing. So while contention may still impact performance in some cases, it should be a lot better now.</p> <p>Because of the changes to how the free-list works, please report any issues you find with this release. That not only includes search time regressions but also significant regressions in memory usage. Reporting improvements is also welcome as well! If possible, provide a reproduction.</p> <p>Bug fixes:</p> <ul> <li>[BUG <a href="https://redirect.github.com/rust-lang/regex/issues/934";>#934</a>](<a href="https://redirect.github.com/rust-lang/regex/issues/934";>rust-lang/regex#934</a>): Fix a performance bug where high contention on a single regex led to massive slow downs.</li> </ul> <h1>1.9.4 (2023-08-26)</h1> <p>This is a patch release that fixes a bug where <code>RegexSet::is_match(..)</code> could incorrectly return false (even when <code>RegexSet::matches(..).matched_any()</code> returns true).</p> <p>Bug fixes:</p> <ul> <li>[BUG <a href="https://redirect.github.com/rust-lang/regex/issues/1070";>#1070</a>](<a href="https://redirect.github.com/rust-lang/regex/issues/1070";>rust-lang/regex#1070</a>): Fix a bug where a prefilter was incorrectly configured for a <code>RegexSet</code>.</li> </ul> <!-- raw HTML omitted --> </blockquote> <p>... (truncated)</p> </details> <details> <summary>Commits</summary> <ul> <li><a href="https://github.com/rust-lang/regex/commit/990979bbdc28fa841e3ad55934ee445cd710d110";><code>990979b</code></a> regex-syntax-0.7.5</li> <li><a href="https://github.com/rust-lang/regex/commit/e008f83090c1fa858cd602da94e9ffdf38fd7317";><code>e008f83</code></a> changelog: 1.9.4</li> <li><a href="https://github.com/rust-lang/regex/commit/c788378d6fe407f4774df98a78436cea5d98525b";><code>c788378</code></a> ci: drop mips, add powerpc and s390x</li> <li><a href="https://github.com/rust-lang/regex/commit/de0339959b491ae0a26e6f96c0b0dc1635bc0f94";><code>de03399</code></a> automata: fix incorrect use of Aho-Corasick's "standard" semantics</li> <li><a href="https://github.com/rust-lang/regex/commit/7536e055840f74f1f7bda8ffecf851cb3e500147";><code>7536e05</code></a> syntax: remove superfluous <code>borrow</code></li> <li><a href="https://github.com/rust-lang/regex/commit/81e328a29f8c57cb3622930104177e8606270230";><code>81e328a</code></a> doc: fix typo in module-level doc</li> <li><a href="https://github.com/rust-lang/regex/commit/10faa44da9134c053c28a55857068909ca29a452";><code>10faa44</code></a> doc: fix a couple typos</li> <li><a href="https://github.com/rust-lang/regex/commit/431c4e4867e1eb33eb39b23ed47c9934b2672f8f";><code>431c4e4</code></a> doc: fix typo in captures_read</li> <li><a href="https://github.com/rust-lang/regex/commit/72f889ef3cca59ebac6a026f3646e8d92f056d88";><code>72f889e</code></a> 1.9.3</li> <li><a href="https://github.com/rust-lang/regex/commit/446ecd6154854274c70b015e6c2718cdf2f48c57";><code>446ecd6</code></a> deps: bump regex-automata to 0.3.6</li> <li>Additional commits viewable in <a href="https://github.com/rust-lang/regex/compare/regex-syntax-0.7.4...regex-syntax-0.7.5";>compare view</a></li> </ul> </details> <br /> [](https://docs.github.com/en/github/managing-security-vulnerabilities/about-dependabot-security-updates#about-compatibility-scores) Dependabot will resolve any conflicts with this PR as long as you don't alter it yourself. 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