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zeekayandYakov Olkhovskiy
26cd4c5eba
When `RewriteAggregateFunctionWithIfPass` rewrites `sum(if(cond, val, null))` to `sumIf(_CAST(val, 'Nullable(T)'), cond)`, the `_CAST` stays as a FunctionNode on the initiator (no resolve pass runs after optimization). On the remote (secondary) server, the same `_CAST` gets constant-folded during re-resolution, producing a ConstantNode with result type `Nullable(T)`. The column naming function `calculateActionNodeNameWithCastIfNeeded` used `getResultType()` for the inner type annotation, which gives `T` on the initiator (from the pre-cast constant) but `Nullable(T)` on the remote (from the folded result). This caused a column name mismatch: - Initiator: `_CAST(0_UInt8, 'Nullable(UInt8)'_String)` - Remote: `_CAST(0_Nullable(UInt8), 'Nullable(UInt8)'_String)` Fix: when the constant was folded from `_CAST` (`receivedFromInitiatorServer` is true), use the source `_CAST` function's first argument type as the inner type annotation. This mirrors how the initiator names it. Closes: https://github.com/ClickHouse/ClickHouse/issues/82941 Co-authored-by: Yakov Olkhovskiy <[email protected]>
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.
- ClickHouse Theater contains presentations and videos about ClickHouse.
- 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.
- Bluesky and X for short news.
- Code Browser (github.dev) with syntax highlighting, powered by github.dev.
- Contacts can help to get your questions answered if there are any.
Monthly Release & Community Call
Join us for the ClickHouse 26.5 Release Call on May 21, 2026.
Watch all release presentations and videos at ClickHouse Theater and YouTube Playlist.
Upcoming Events
Keep an eye out for upcoming meetups and events around the world. Want to speak? Apply here You can also peruse ClickHouse Events for a list of all upcoming trainings, meetups, speaking engagements, etc.
Upcoming meetups
- Stockholm Meetup - June 9th, 2026
- LA Happy Hour - June 10th, 2026
- ClickHouse + Hex AI hackathon- June 11th, 2026
- Meetup São Paulo - June 11th, 2026
- Paris Meetup - June 11, 2026
- ClickHouse Cafe @ Data & AI Summit - June 16th, 2026
- NY Happy Hour - June 17th, 2026
- Seattle Iceberg Meetup - June 25th, 2026
- KL Meetup - June 26th, 2026
- AI Demo Night SF - July 1st, 2026
- Data at scale Amsterdam - July 7th, 2026
- AI Builders Night NY - July 8th, 2026
- Happy Hour Open Source de Montréal - July 9th, 2026
- AI Builders Night SF- July 14th, 2026
- Bangkok OSS & Data Evening: Queries, Code & Community - July 23, 2026
Recent meetups
- Toronto Meetup - June 2nd, 2026
- AI Demo Night NY - May 21st, 2026
- Chicago Meetup - May 19th, 2026
- Agentic AI Unplugged: Bengaluru Edition - May 15th, 2026
- Long Beach Pycon Party - May 15th, 2026
- ClickHouse + Cast AI Meetup (Singapore) - May 6th, 2026
- Boston Meetup - May 6th, 2026
Recent Recordings
- Recent Meetup Videos: Meetup Playlist Whenever possible recordings of the ClickHouse Community Meetups are edited and presented as individual talks.
Interested in joining ClickHouse and making it your full-time job?
ClickHouse is a nice DBMS, and it's a good place to work.
Check out our current openings here: https://clickhouse.com/company/careers
Email: [email protected]!