clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Skip statistics and skip index pruning for parts with pending mutations
- Move virtual row read-ahead and buffering into a new VirtualRowReadAheadTransform
- Add an `<http>` user directory backed by `<http_authentication_servers>`
- Switch the samples inner table of the TimeSeries engine to a bucketed schema
- Cache part statistics and selectivity estimators to make query planning with statistics cheap
- Check `allow_statistics` only when validating a mutation, not when running it
- Check if StringHashTable can be abolised in favor of packed strings
- CI: require only one package flavour per Install packages job
- Let an in-flight replicated DDL entry finish before DETACH DATABASE detaches its tables
- Attach the correlated-subquery set builder below the materialized CTE steps
- Docs
- C++ not yet supported