clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- 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)
- Improve selective reads for positional text formats
- [RFC] Top-K Search Infrastructure
- Add `SCHEME 'BEARER'` to `<http_authentication_servers>` for delegated token verification
- Adding RowBinaryWithNamesAndTypesAndDefaults
- Docs
- C++ not yet supported