clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Reject NaN and infinite polygon vertices at dictionary load time
- ASOF JOIN cannot use parallel_hash; serial HashJoin build is the wall for time-series workloads
- [RFC] Adaptive Compression Codec Selection
- DataLake setting 'skip_non_iceberg_tables'
- Add `merge_selector_min_age_to_disable_right_tail_heuristic` to disable right tail heuristic partitions no longer being written to
- Support symbolic PromQL timestamp modifiers
- Support Float16 type inside ClickHouse
- EXPLAIN omits `vector_similarity` skip index when query is not bare `ORDER BY distance ASC LIMIT N`
- Document `ALTER TABLE` cost class (metadata / async mutation / sync rewrite)
- Optimize filtered constant columns
- Docs
- C++ not yet supported