clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Fix on-fly mutation LowCardinality pass-through column conversion
- Add partial aggregate cache server infrastructure (Intern Tasks 2025/2026)
- Add docker cleanup post-hook to install_check master jobs
- Simplify and optimize building of text indexes
- Skip data reading step entirely for `TTLDrop` merges to avoid excessive memory usage
- Use text index for LIKE/ILIKE with ESCAPE
- Fix BAD_GET in sumMap over Nested(Nullable(Decimal))
- singleValueOrNullState / singleValueOrNullMerge lose semantic state during merge and serialization
- Logic Error: Correlated Columns in EXISTS SELECT List Change Query Semantics
- RFC: Per-part intermediate aggregate cache for MergeTree GROUP BY (Intern Tasks 2025/2026)
- Docs
- C++ not yet supported