clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Share effective access rights between sessions of the same user
- A column defined as ALIAS/DEFAULT/MATERIALIZED with a bare IN table expression is accepted at CREATE, then every read throws a Not-ready Set logical error and a mutation referencing it wedges permanently
- DeltaLake (delta-kernel): CREATE TABLE ... ENGINE=DeltaLake blocked forever in SnapshotBuilder::build → read_files → mpmc recv (no timeout); on the DDLWorker thread it wedges the whole distributed DDL queue and cannot be cancelled
- RESTORE ... AS mis-renames table references: several carriers are missed, and the IN right-hand side is renamed when it must not be
- Vector search after a lightweight DELETE returns fewer rows than LIMIT and misses true nearest neighbors, down to an empty result (26.7 regression)
- 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
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- C++ not yet supported