clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Use the page cache and the distributed cache for object storage reads by default
- Docs: regenerate the 2026 changelog for 26.10
- Casting `JSON` to another `JSON` type shifts a typed `DateTime` path when its type and time zone both change, also in `ALTER TABLE ... MODIFY COLUMN`
- Fix deadlock in ProcessList::killAllQueries with distributed query plans
- Hoist raw pointers out of the row loop of `FunctionMultiIf::executeInstructionsColumnar`
- Page-align `array_array_container_inplace_union`
- Fix `04105_system_pause_view` and `04319_system_stop_all_background` with the database disk on object storage
- Do not allocate an error message per parsed field in `parseDateTime`
- Fix `ALTER UPDATE` of a column TTL input corrupting a Wide part or never finishing
- Docs: remove ClickPipes_FetchedEvents_PerTable metric
- Docs
- C++ not yet supported