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ClickHouse® is a real-time analytics DBMS
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The new per-dictionary settings control regex match semantics around case sensitivity and the '.' wildcard with newlines. They must be set at the dictionary level since they're applied to regex engines at pattern-compile-time. - regexp_dict_flag_case_insensitive: case insensitive matching - regexp_dict_flag_dotall: '.' matches all characters including newlines They correspond to HS_FLAG_CASELESS and HS_FLAG_DOTALL in Vectorscan and case_sensitive and dot_nl in RE2. These are the most useful options compatible with the internal behavior of RegExpTreeDictionary around splitting up simple and complex patterns between Vectorscan and RE2. The alternative is to use (?i) and/or (?s) for all patterns. However, (?s) isn't handled properly by OptimizedRegularExpression::analyze(). And while (?i) is, it still causes the dictionary to treat the pattern as "complex" for sequential scanning with RE2 rather than multi-matching with Vectorscan, even though Vectorscan supports case insensitive literal matching. Setting dictionary-wide flags is both more convenient, and circumvents these problems. |
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ClickHouse® is an open-source column-oriented database management system that allows generating analytical data reports in real-time.
How To Install (Linux, macOS, FreeBSD)
curl https://clickhouse.com/ | sh
Useful Links
- Official website has a quick high-level overview of ClickHouse on the main page.
- ClickHouse Cloud ClickHouse as a service, built by the creators and maintainers.
- Tutorial shows how to set up and query a small ClickHouse cluster.
- Documentation provides more in-depth information.
- YouTube channel has a lot of content about ClickHouse in video format.
- Slack and Telegram allow chatting with ClickHouse users in real-time.
- Blog contains various ClickHouse-related articles, as well as announcements and reports about events.
- Code Browser (Woboq) with syntax highlighting and navigation.
- Code Browser (github.dev) with syntax highlighting, powered by github.dev.
- Static Analysis (SonarCloud) proposes C++ quality improvements.
- Contacts can help to get your questions answered if there are any.
Upcoming Events
- v23.8 Community Call - Aug 31 - 23.8 is rapidly approaching. Original creator, co-founder, and CTO of ClickHouse Alexey Milovidov will walk us through the highlights of the release.
- ClickHouse & AI - A Meetup in San Francisco - Aug 8
- ClickHouse Meetup in Paris - Sep 12
Also, keep an eye out for upcoming meetups around the world. Somewhere else you want us to be? Please feel free to reach out to tyler clickhouse com.
Recent Recordings
- Recent Meetup Videos: Meetup Playlist Whenever possible recordings of the ClickHouse Community Meetups are edited and presented as individual talks. Current featuring "Modern SQL in 2023", "Fast, Concurrent, and Consistent Asynchronous INSERTS in ClickHouse", and "Full-Text Indices: Design and Experiments"
- Recording available: v23.6 Release Webinar All the features of 23.6, one convenient video! Watch it now!
- All release webinar recordings: YouTube playlist
Interested in joining ClickHouse and making it your full-time job?
We are a globally diverse and distributed team, united behind a common goal of creating industry-leading, real-time analytics. Here, you will have an opportunity to solve some of the most cutting-edge technical challenges and have direct ownership of your work and vision. If you are a contributor by nature, a thinker and a doer - we’ll definitely click!
Check out our current openings here: https://clickhouse.com/company/careers
Cant find what you are looking for, but want to let us know you are interested in joining ClickHouse? Email careers@clickhouse.com!