clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Fix wrong results through a projection after MODIFY COLUMN changes the type of its ORDER BY column
- Fix `Map` subscript matching an out-of-range integer to another key
- A kill between the deduplication log flush and the part commit makes a retried INSERT silently lose rows on plain MergeTree
- 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)
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- C++ not yet supported