clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Apply `http_forbid_headers` to credentials sent in the `Authorization` header
- Reduce CPU usage of thread pools with many threads waiting for a free slot
- Untie Sliding Blocks and Output Chunks in `WindowTransform`
- Enable query_plan_top_k_through_array_join by default
- Introduce `SlidingArguments` for `WindowTransform`
- Make tests pass with plan-based parallel replicas (counters, EXPLAIN, row order)
- Do not copy Parquet `String` values beyond the top-K threshold for `ORDER BY <String> LIMIT`
- ClickHouse Iceberg Catalog: Add Drop Namespace
- Fix wrong `ORDER BY` results and `pushed bucket twice` with offset based parallel replicas
- Do not stream server warnings to the clients in 05361_postgresql_mysql_self_connect_enum
- Docs
- C++ not yet supported