clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Fix a wrong result and a rejected query in the `AND` comparison-chain optimization
- Require SHOW COLUMNS to read DDL columns in system.tables
- Authorize a restored view's external targets
- Spatial pruning is given up in cases the predicates accept at runtime (`Geometry`/`Variant`/`Dynamic`, invalid or empty constant geometries)
- Stop rebuilding serializations and Nested types per MergeTree reader
- Add JSONEachRowWithNames and JSONEachRowWithNamesAndTypes formats
- Query condition cache serves another session's verdict when an omitted DateTime timezone hides inside a wrapper type: rows silently vanish
- `optimize_injective_functions_in_group_by` drops a constant-NULL grouping key on two-argument `toString(x, NULL)` — silent wrong result
- Iceberg variant type
- Ordered-set cancel guard ignores `source_preserved`, killing partial-result recovery
- Docs
- C++ not yet supported