clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Prune ORC row groups by predicates on a monotonic function of a column
- Fix `sumMergeOrNull` rejecting `sum` states
- Skip a table that failed to load in system tables instead of failing the whole query
- Adaptive TopK Aggregation
- Add `XLSX` input/output and `XLS` input formats
- Fix the native macOS build with the macOS 27 SDK by removing libc++'s `float.h`
- Add `FixedArray` data type, subscripts `arr[i, j]` and `arr[][j]`, and `einsum`
- Isolate the filesystem of the server at startup
- Aggregate long runs of a single GROUP BY key through the constant-key path
- Keep the stable task distribution of object storage files when replicas are balanced
- Docs
- C++ not yet supported