clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Precompute hashes and prefetch for fixed-size-keys aggregation methods
- Read and checksum the UNIQUE KEY dense-index SST through IDataPartStorage
- CI: run the full test suite only when review threads are resolved
- Support DEFINER / SQL SECURITY for dictionaries
- Deduplicate the final DISTINCT in parallel
- Fix join NDV propagation for distributed aggregation
- Support quoted PromQL grouping labels
- Optimize merges of the text index
- Add `/dialect`, `/lang`, `/language` client commands
- Mongo queries: keep whole documents in a JSON column
- Docs
- C++ not yet supported