clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Prometheus HTTP API: implement /api/v1/format_query
- Use PREWHERE for filters pushed down into JOIN sides
- Fix optimize_functions_to_subcolumns rewriting onto the wrong subcolumn
- Size integration test workers from the job cgroup limit instead of host RAM
- Support PromQL count_values
- Report a missing object in local object storage as FILE_DOESNT_EXIST instead of STD_EXCEPTION
- Do not let lambda arguments capture identifiers of aliased expressions
- Mixing lightweight and heavyweight mutations permanently wedges a MergeTree table (`NOT_FOUND_COLUMN_IN_BLOCK: _row_exists`)
- use_top_k_dynamic_filtering puts __topKFilter in PREWHERE instead of the ones that predicate optimize_move_to_prewhere would move there
- Docs: move documentation MCP setup to a dedicated page
- Docs
- C++ not yet supported