clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Logic error: INNER JOIN ON and equivalent CROSS JOIN + WHERE produce different results
- Logic error: Non-Optimizing Reference Engine Construction breaks LEFT JOIN NULL semantics
- No predicate pushdown when selecting from left join
- `WindowTransform`: stream `lagInFrame` via `StreamingLagTransform` to…
- Document settings to show data in /dashboard
- Fix FREEZE permanent failure on empty shadow/increment.txt
- Add partial aggregate cache server infrastructure (Intern Tasks 2025/2026)
- Use text index for LIKE/ILIKE with ESCAPE
- singleValueOrNullState / singleValueOrNullMerge lose semantic state during merge and serialization
- RFC: Per-part intermediate aggregate cache for MergeTree GROUP BY (Intern Tasks 2025/2026)
- Docs
- C++ not yet supported