clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- High latency (~50s) for vector similarity queries despite HNSW index due to coarse-grained pruning and scan-heavy execution
- Partition pruning fix with date transforms
- Use partition minmax to tighten unknown PK bounds in mark selection
- Make the Alias table engine non-experimental
- Preserve filesystem cache name in SYNC formatter
- Add `optimize_trivial_group_by_count_query` optimization
- Fix Cranelift stack overflow on aarch64-apple-darwin
- Implement PromQL histogram_quantile function
- `get_effective_scale` returns `nullopt` for Decimal types, causing JIT-compiled `multiIf` to skip scale conversion
- Clickhouse fails to parse unix micro and nano with best effort
- Docs
- C++ not yet supported