clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- DataLake setting 'skip_non_iceberg_tables'
- Add `merge_selector_min_age_to_disable_right_tail_heuristic` to disable right tail heuristic partitions no longer being written to
- Support symbolic PromQL timestamp modifiers
- Support Float16 type inside ClickHouse
- EXPLAIN omits `vector_similarity` skip index when query is not bare `ORDER BY distance ASC LIMIT N`
- Document `ALTER TABLE` cost class (metadata / async mutation / sync rewrite)
- Optimize filtered constant columns
- Analyzer: `INSERT` and `CREATE TABLE` are ~100× slower than old analyzer on a single `MATERIALIZED` column with a very large expression
- SHOW CREATE ROW POLICY returns 'restrictive'/'permissive' in lowercase instead of uppercase
- HTTP header / timeout settings: declared user-modifiable, actually consumed only from server-startup `HTTPContext`
- Docs
- C++ not yet supported