clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Column TTL resets the source column to its default without recomputing dependent MATERIALIZED columns — permanently stale values
- HudiMetadata lazily initializes its shared file list without synchronization — data race between concurrent queries on one Hudi table
- Skip statistics and skip index pruning for parts with pending mutations
- Statistics-based part pruning uses a pending-renamed column's stale statistics — silent missing rows at default settings
- Move virtual row read-ahead and buffering into a new VirtualRowReadAheadTransform
- Correlated subquery equivalence substitution loses rows for Array/Tuple/Map with float elements: the stitch join compares bitwise, so -0.0 stops matching 0.0
- Add an `<http>` user directory backed by `<http_authentication_servers>`
- Switch the samples inner table of the TimeSeries engine to a bucketed schema
- Cache part statistics and selectivity estimators to make query planning with statistics cheap
- Backport #113154 to 26.7: Text index: inject tokenizer properly to supported functions outside WHERE/PREWHERE
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