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ClickHouse® is a real-time analytics DBMS
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The SipHash-128 values of the strings are calculated and stored in a set when the UniqExact aggregate function is applied to a Column- String, as the following snippet shows: StringRef value = column.getDataAt(row_num); UInt128 key; SipHash hash; hash.update(value.data, value.size); hash.get128(key); The implementation of SipHash requires an internal 8-byte buffer, current_word (or current_bytes), for holding the input data in the cross function calls of SipHash::update and SipHash::get128. But, in the above situation, where the update and get128 only take place once, the copy of input data to the buffer is unnecessary. With get128 inlined, the compiler could optimize the code as a whole and reduce the unexpected memory operations, and as a result, the query performance is improved. |
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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
- v23.6 Release Webinar - Jun 29 - 23.6 is rapidly approaching. Original creator, co-founder, and CTO of ClickHouse Alexey Milovidov will walk us through the highlights of the release.
- ClickHouse Meetup in Boston - Jul 18
- ClickHouse Meetup in NYC - Jul 19
- ClickHouse Meetup in Toronto - Jul 20
- ClickHouse Meetup in Singapore - Jul 27
- 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: v23.4 Release Webinar Faster Parquet Reading, Asynchonous Connections to Reoplicas, Trailing Comma before FROM, extractKeyValuePairs, integrations updates, and so much more! 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 as well as 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!