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ClickHouse® is a real-time analytics DBMS
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For left ARRAY JOIN, expand to the greatest size. If all sizes are zero, resize to one which is the same as the old behavior, i.e. emptyArrayToSingle For non-left ARRAY JOIN, expand to the greatest size but keep empty if all sizes are zero. |
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ClickHouse
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.
- Blog contains various ClickHouse-related articles, as well as announces and reports about events.
- 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.