clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- ATTACH PARTITION FROM into VersionedCollapsingMergeTree silently produces wrong results
- Spilling DISTINCT on a Float64 key drops rows via comparison-based dedup
- Mutation `IN` literal list skips session-timezone rewrite: wrong rows deleted
- Add `hasAnyTokenLike` and `hasAllTokenLike` functions with text index support
- Make Row Policies tolerate ALTER COLUMN
- Fix wrong results after a JOIN poisons the query condition cache
- Merge Fan-In
- Key mark-cache entries on the part that owns the marks so `prewarm_mark_cache` warms projections
- [CI] Consolidate duplicated tests/ci helpers onto their ci/ (praktika) twins — one PR per helper
- Convert between a map and an array of key-value pairs in Field conversions
- Docs
- C++ not yet supported