clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Iceberg: support ATTACH PARTITION and REPLACE PARTITION FROM on object-storage tables
- Iceberg: support add_files and replace_files (register existing data files into a table)
- The filter left in WHERE after a partial move to PREWHERE loses its query condition cache key, so repeated queries read more granules
- Support AI functions in background mutations
- 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
- Docs
- C++ not yet supported