clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Analyzer: `INSERT` and `CREATE TABLE` are ~100× slower than old analyzer on a single `MATERIALIZED` column with a very large expression
- SHOW CREATE ROW POLICY returns 'restrictive'/'permissive' in lowercase instead of uppercase
- HTTP header / timeout settings: declared user-modifiable, actually consumed only from server-startup `HTTPContext`
- Release pull request for branch 26.5
- Window function with lagInFrame over Map columns causes OOM on 8GB RAM for ~3M rows
- Reject nested Dynamic/Variant in min/max aggregates and minmax indexes
- Expose aggregate dictionary metrics in system.asynchronous_metrics
- last_success_time / next_refresh_time inconsistency in system.view_refreshes
- Restore PK/skip-index pruning for PREWHERE IN (subquery)
- Redis handler
- Docs
- C++ not yet supported