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ClickHouse® is a real-time analytics DBMS
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Previous set of QueryProcessingStage does not allow to do this. But after WithMergeableStateAfterAggregation had been introduced the following queries can be optimized too under optimize_distributed_group_by_sharding_key: - GROUP BY sharding_key LIMIT - GROUP BY sharding_key LIMIT BY - GROUP BY sharding_key ORDER BY And right now it is still not supports: - WITH TOTALS (looks like it can be supported) - WITH ROLLUP (looks like it can be supported) - WITH CUBE - SETTINGS extremes=1 (looks like it can be supported) But will be implemented separatelly. vX: fixes v2: fix WITH * v3: fix extremes v4: fix LIMIT OFFSET (and make a little bit cleaner) v5: fix HAVING v6: fix ORDER BY v7: rebase against 20.7 v8: move out WithMergeableStateAfterAggregation v9: add optimize_distributed_group_by_sharding_key into test names |
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ClickHouse is an open-source column-oriented database management system that allows generating analytical data reports in real time.
Useful Links
- Official website has quick high-level overview of ClickHouse on main page.
- Tutorial shows how to set up and query 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 to chat with ClickHouse users in real-time.
- Blog contains various ClickHouse-related articles, as well as announcements and reports about events.
- Code Browser with syntax highlight and navigation.
- Yandex.Messenger channel shares announcements and useful links in Russian.
- Contacts can help to get your questions answered if there are any.
- You can also fill this form to meet Yandex ClickHouse team in person.
Upcoming Events
- ClickHouse at ByteDance (in Chinese) on August 28, 2020.
- ClickHouse Data Integration Virtual Meetup on September 10, 2020.