clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Server SEGFAULT in `SingleValueDataGenericWithColumn::read` for `singleValueOrNull(JSON)` because `result_type` (`Nullable(JSON)`) is passed instead of `value_type` (`JSON`)
- `StorageMerge` filter `WHERE _table='X'` returns no rows when underlying table has a physical `_table String` column shadowing the virtual
- pointwiseEqual post-loop sign-extension check unconditionally applies signed two's complement logic, returning empty for unsigned values with the high bit set
- `return` in `updateMatchedColumnsFromJoinUsing` exits entire function, skipping type updates for subsequent USING columns
- PR #96022 validation removed by later refactoring: RENAME COLUMN before UPDATE/DELETE on same column violates ALTER atomicity
- `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)
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- C++ not yet supported