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Raúl MarínandClaude Opus 4.8
8b7c8eb1c1
The struct-into-Nullable gate only checked `allow_experimental_nullable_tuple_type`, but the library reader also enables `Nullable(Tuple(...))` when the requested target type is already nullable. So reading Arrow data with the setting off into an existing `Nullable(Tuple)` column (or nested `Array(Nullable(Tuple))`) dropped the struct-level null map and decoded the child payload as a real value row instead of `NULL`. `decodeField` now wraps a struct in Nullable when the setting is on OR the effective target hint at this field is nullable (matching the library's `allow_nullable_struct`), resolving the hint via `resolveTargetHint` so both top-level and nested fields honor it. `decodeColumns` reconciles the reported type with the decoded column via `matchColumnNullability`, so the column/type pair stays consistent when `decodeField` wraps a struct that `fieldToCHType` (setting-only) left as a plain Tuple. Co-Authored-By: Claude Opus 4.8 (1M context) <[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
- AI Builders Offstage: Docker & ClickHouse - 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
- Data at Scale Amsterdam - October 14th, 2026
Recent meetups
- AI Demo Night SF - July 1st, 2026
- KL Meetup - June 26th, 2026
- Seattle Iceberg Meetup - June 25th, 2026
- NY Happy Hour - June 17th, 2026
- ClickHouse Cafe @ Data & AI Summit - June 16th, 2026
- Paris Meetup - June 11, 2026
- Meetup São Paulo - June 11th, 2026
- ClickHouse + Hex AI hackathon- June 11th, 2026
- LA Happy Hour - June 10th, 2026
- Stockholm Meetup - June 9th, 2026
- Toronto Meetup - June 2nd, 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]!