clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- `db.object` references outside FROM still fail when a table is aliased `db`
- Recursive CTE named `db` captures `db.t` instead of resolving the real table
- Iceberg open under staleness takes metadata path cached for another container
- Peer-group index ignores `COLLATE`: `cume_dist` of last row < 1
- `MATERIALIZE TTL` with `materialize_ttl_recalculate_only = 1` rewrites compact parts completely
- MODIFY COLUMN changing only uniq state version breaks reads of old parts
- uniqMerge drastically underestimates after wide sample thins just below 8192
- `clickhouse-client` uses state version 1 for pre-upgrade `uniq` columns
- Mixed v0/v1 `uniq` states not relabelled, `GROUP BY` returns garbage (#115393)
- Text index: a `LIKE '%x%'` scans the whole dictionary of a part even after an exact token in the same `AND` already ruled the part out
- Docs
- C++ not yet supported