clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Cherry pick #129193 to 26.9: Fix server abort when an Arrow Flight query throws while finishing
- Cherry pick #129193 to 26.10: Fix server abort when an Arrow Flight query throws while finishing
- Backport #126519 to 26.3: Fix `CANNOT_SCHEDULE_TASK` in partitioned Iceberg `INSERT` with many partitions
- STRING_AGG(DISTINCT x, sep) fails: groupConcat requires single argument
- Projected `a.id` is named `a.id` instead of `id` when three or more joined tables share the column name
- Support correlated subqueries in `JOIN ON` expressions
- Support `unnest` as a table function in `FROM` / `JOIN` (PostgreSQL / SQL standard)
- LATERAL join: support comma and `CROSS JOIN` forms, `arrayJoin` inside the subquery, and non-trivial `ON`
- Support correlated subqueries as the right-hand side of `IN`
- PostgreSQL compatibility functions: `string_to_array`, `split_part`, `array_length`, `random`, `to_timestamp`, `regexp_split_to_array/table`
- Docs
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