clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Move more fields from MergeTreeDataPart into a shared per-table cache
- Add PartialAggregateCache for part-level aggregate caching.
- Introduce `nested` and `non-atomic` multi keeper operations
- Smash string similarity
- Engine=Kafka support for rack-aware consumption for Amazon MSK, IMDSv2
- Optimize joins with empty input
- Cherry pick #91553 to 25.3: Fix crash in a single-node cluster when reading from Iceberg in split-by-buckets mode
- Cherry pick #91553 to 25.8: Fix crash in a single-node cluster when reading from Iceberg in split-by-buckets mode
- Check total memory limit overflow earlier.
- feat: Add string subscript and slicing operators
- Docs
- C++ not yet supported