clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- `injectRequiredColumns` filter excludes renamed columns, fallback re-introduces `NO_SUCH_COLUMN_IN_TABLE`
- Shorthand setting syntax accepts unknown setting names due to `castValueUtil` custom settings bypass
- `ASTWindowListElement::definition` not in `children` during parsing — query parameters in named WINDOW definitions are not substituted
- Add SCANN Vector Index Support
- DataLakeCatalog: `RestCatalog::getTables` does not paginate, hides tables in large namespaces (OneLake/BigLake/Iceberg REST)
- [WIP] Add table-level ANN index with DiskANN backend
- `allow_experimental_reverse_key`: timeline to beta/stable? 5-7x performance gap with InReverseOrder
- Backport #103376 to 26.4: Remove duplicate entries from SettingsChangesHistory
- RFC: Table-Level ANN Index Framework for `ClickHouse`
- Refactor S3 credential chain and AWS logging for region resolution
- Docs
- C++ not yet supported