clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Object storage client never offers ALPN, so HTTP/2 is unreachable on stores that serve it
- OpenTelemetry spans for the parallel replicas coordinator and per-replica reads
- FETCH PARTITION silently loses acknowledged lightweight UPDATEs: the source's patch parts are never fetched
- Pretty and Vertical formats should highlight JSON
- Allow a duplicated input when the `filesystem` table function filters cheap columns
- Not-ready Set inside a running FilterTransform: the plan hands the pipeline an unbuilt IN set (STID: 0250-4e52)
- Window functions with PARTITION BY are ~4x slower than DuckDB on the same data
- JSONPath `[*]` wildcard drops non-array (scalar) values instead of RFC 9535 lax-mode auto-wrapping
- Silent row loss: a merge racing `DETACH PARTITION` commits an empty part that covers the detached data, and `ATTACH PARTITION` then strands the rows as `inactive_*`
- Keeper: the watch set by FilteredListWithStatsAndData does not fire on children data changes
- Docs
- C++ not yet supported