clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Fix(Geo): Read Geometry subcolumns from expressions
- Fix Iceberg time with nanosecond precision.
- Use `advanced` JSON shared data serialization only for parts above a size threshold, not for every merged part
- Wrong result: parallel replicas read a materialized view created separately on each replica once per replica
- BSONEachRow writes wrong nested document size when dotted names collide
- Iceberg `OPTIMIZE` writes metadata from scratch: field ids and partition spec lost
- Iceberg `OPTIMIZE` brings back rows of a dropped partition
- toUTCTimestamp is 1 h off near DST transitions
- Covering-index `INCLUDE` columns in sorting key: DELETE/UPDATE leave stale rows
- Restored MaterializedPostgreSQL tables mis-sorted, giving wrong query results
- Docs
- C++ not yet supported