clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- The `Replicated` mutation determinism guard misses a non-deterministic function hidden in an `ALIAS` or recomputed `MATERIALIZED` column — replicas mutate divergently and reconcile by first-committer-wins download
- ATTACH PARTITION after re-adding a skip index under a dropped index's name silently returns wrong results with no pending mutation
- Iceberg sorted insert: data files violate the declared sort order across insert blocks because the cross-block file-split guard is dead code
- Mutation predicate with a function-wrapped DateTime literal skips the session-timezone rewrite: wrong rows deleted
- BACKUP of a File-engine table (data-path form) silently stores no data; RESTORE reports success with all rows lost
- MergeTreeDeduplicationLog: DROP records count toward the deduplication window, so DROP PART traffic deletes the log holding still-live block IDs and a deduplicated INSERT silently duplicates rows after restart
- Filter with dictGetDescendants / dictGetChildren is pushed down to remote shards and answered against the shard's local dictionary (wrong result or error)
- BACKUP of a Distributed table silently omits the pending on-disk insert queue: acknowledged rows a graceful restart delivers are lost after RESTORE
- `T64('bit')` writes all-zero planes for 8-bit `UInt8` blocks in `amd_release`
- `distributed_ddl_use_initial_user_and_roles` does not preserve current roles and authentication restrictions of the initiator
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