clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Metadata scan creates inline `disk(...)`: one bad disk stops server startup
- INSERT inside a transaction fails on projection's ProjectionSource check
- Leftover `local_cache_for_remote_fs` config key crashes server startup on 26.8+
- RENAME DATABASE misses cyclic Alias('t') dependency after restart
- Window sort skip re-reads fair share: nested partitions wrong under load
- THERE_IS_NO_QUERY reading or merging old parts with an AI-function DEFAULT
- `peer_group_indexes` adds 8 bytes per buffered row: window peak memory +50-355%
- Do not rebuild the whole-block LowCardinality position cache for every run of aggregation in order
- Plan-based parallel replicas evaluate a non-deterministic broadcast join side once per replica
- Allow users to manage their own authentication methods
- Docs
- C++ not yet supported