clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- `rewrite_in` prunes another table's `IN`: distributed table matched by alias
- `rewrite_in` mutates an `IN` node that `WHERE` shares with `GROUP BY`
- performance regression with `query_plan_optimize_join_order_limit=10` on 26.6.1.2244
- Use projections for Merge children missing a SUM measure
- Fix `Merge` reads whose tables produce different column sets
- Do not share the reference counter of cached serializations between threads
- Keep a cluster engine read local with `parallel_replicas_allow_in_with_subquery = 0`
- Reserve disk space for the mutation of a part whose TTL has expired
- Split `max_threads` among the local tasks of a distributed-plan stage
- Fix `ssd_cache` dictionaries with the same `PATH` returning each other's values
- Docs
- C++ not yet supported