clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Fix exclusive `S3Queue` path after restart in `Replicated` database
- Fixes #119378
- Fix(Analyzer): uniq-to-count rewrite with duplicate arguments
- Can Clickhouse on Iceberg leverage the multi-stage distributed query execution instead of ReadFromCluster
- ILIKE SOME 20x slower than OR
- countIfOrNull over Nullable counts NULL rows for non-0/1 condition bytes
- valid_before_epoch checks whole minutes, not whole N minutes, for N-minute intervals
- `roundDown` skips intra-day offset change: `toStartOfHour` gives :30 buckets
- Chained `json['a']['b']` flattened across a typed path reads the wrong subcolumn
- External tags `id` type with no automatic generator: CREATE now refused
- Docs
- C++ not yet supported