clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Fix `has`/`mapContains` on constant `Enum` arrays and maps searched by name
- allow_feature_tier is not enforced when a role or settings profile changes which settings apply
- Iceberg / DataLakeCatalog: repeated immutable work on every warm query
- Allow multiple hosts in clickhouse keeper-client
- `hasAll` on `Array(IntN)` is up to 13x slower on aarch64 — the vectorised set-intersection kernel is `__AVX2__`-only
- mortonDecode has no pdep/pext equivalent on aarch64 and decodes through eight dependent table lookups per row
- `VarMoments` accumulates scalar-at-a-time on aarch64 — `kurtSamp` and `stddevPopIf` up to 3.93x slower than on x86-64
- Add a two-level step identity and memo group deduplication to the Cascades optimizer
- Read and write HTTP bodies through ReadBuffer/WriteBuffer instead of std::iostream
- Stop new S3 reads after MergeTree query cancellation
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- C++ not yet supported