clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- `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
- uniq drops to saturated 32-bit estimate when 64-bit sample thins below 8192
- Fix JOIN USING keys from aliases colliding on a synthesized `_` name
- Keeper lock timeout not clamped: huge value overflows `try_lock_for`
- Block nested loop join never calls addExecutedJoin, used_number_of_joins stays 0
- `checkDataPart` skips `txn_version.txt` only if it existed before the scan
- Feature request: persist table owner/definer on CREATE TABLE (like materialized views)
- areEquivalentKeys treats sibling nested keys as overrides of each other
- Docs
- C++ not yet supported