clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Follow server memory in both directions when shedding test workers
- `SELECT DISTINCT` fails to deduplicate all-NULL rows from a mixed-branch `multiIf` supertype-coerced to `Nullable(String)` — silent wrong result under default settings
- Correlated scalar subquery `(SELECT nan_col) IS NULL` returns wrong result under default `query_plan_enable_optimizations` — silent wrong result on plain `MergeTree`
- Enable `-mbranch-protection=pac-ret` on ARM
- Fix rows silently dropped by a join runtime filter on a NaN or -0.0 float key
- `Field::restoreFromDump` cannot parse nested containers, so any map-valued custom setting (`SET SQL_x = {'k':'v'}`) bricks a native-protocol session and fails every distributed query
- Reused MATERIALIZED CTE named after a table re-binds to itself: TOO_DEEP_SUBQUERIES
- feat(promql): Add float-only remote-write v2.
- Introduce Lazy Preformatted Message
- Fix S3Queue/AzureQueue metadata drop and create on a shared keeper_path
- Docs
- C++ not yet supported