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ClickHouse® is a real-time analytics DBMS
8a5bd2defa
:) explain plan select * from table1 t1 left join table2 t2 on t1.name = t2.name; ┌─explain──────────────────────────────────────────────────────────────────────────────────────┐ │ Expression ((Projection + Before ORDER BY)) │ │ Join (JOIN) │ │ Expression (Before JOIN) │ │ SettingQuotaAndLimits (Set limits and quota after reading from storage) │ │ ReadFromMergeTree (default.table1) │ │ Expression ((Joined actions + (Rename joined columns + (Projection + Before ORDER BY)))) │ │ SettingQuotaAndLimits (Set limits and quota after reading from storage) │ │ ReadFromMergeTree (default.table2) │ └──────────────────────────────────────────────────────────────────────────────────────────────┘ :) explain pipeline select * from table1 t1 left join table2 t2 on t1.name = t2.name; ┌─explain──────────────────────────────────────────┐ │ (Expression) │ │ ExpressionTransform × 24 │ │ (Join) │ │ JoiningTransform × 24 2 → 1 │ │ Resize 1 → 24 │ │ FillingRightJoinSide │ │ Resize 24 → 1 │ │ (Expression) │ │ ExpressionTransform × 24 │ │ (SettingQuotaAndLimits) │ │ (ReadFromMergeTree default.table1) │ │ MergeTreeThread × 24 0 → 1 │ │ (Expression) │ │ ExpressionTransform × 24 │ │ (SettingQuotaAndLimits) │ │ (ReadFromMergeTree default.table2) │ │ MergeTreeThread × 24 0 → 1 │ └──────────────────────────────────────────────────┘ |
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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 a quick high-level overview of ClickHouse on the main page.
- 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 highlight and navigation.
- Code Browser (github.dev) with syntax highlight, powered by github.dev.
- Contacts can help to get your questions answered if there are any.