clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Reuse LowCardinality aggregation mappings across blocks
- Schedule text-index virtual columns first in the PREWHERE cost model
- Fix signed integer overflow reading Iceberg decimal bounds
- Mask the Azure shared access signature carried in a url argument
- Support `Merge` tables with plan-based parallel replicas
- Fix data race and silent data loss on the object-storage path list
- Apply a row policy to a read shipped as a serialized query plan
- `SelectedRows`/`SelectedBytes`/`read_rows` overstate the work done by lazy materialization, reporting +35% for a plan that reads 58% fewer compressed bytes
- S3Queue `after_processing='move'` silently destroys a consumed file on a basename collision (default `move_preserve_path=false`)
- Iceberg writer serializes day/hour partition transforms as non-canonical `days`/`hours`, breaking external readers (pyiceberg: UnknownTransform)
- Docs
- C++ not yet supported