clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Missing metadata_version.txt silently loses column data on ATTACH of a part detached before a metadata-only ALTER (corrects "missing file is safe" in #116481)
- Skip a value-preserving narrowing cast in an index condition, and fix pruning for a cast into Bool
- Fix(Column): ColumnDynamic::insertManyFrom for NULL values
- Add `instrument profile` skill
- Backport #116129 to 26.3: Fix iceberg identity partitioned reading
- Backport #116129 to 26.7: Fix iceberg identity partitioned reading
- BACKUP and FREEZE silently drop acked lightweight UPDATEs (patch parts): RESTORE returns pre-update values
- TTLDrop merge short-circuit silently discards live lightweight-UPDATE patch parts (deletes un-expired rows)
- Plain MergeTree: a concurrent heavyweight ALTER UPDATE/DELETE silently drops an acknowledged in-flight lightweight UPDATE (no havePendingPatchPartsForMutation guard on the mutation-selection path)
- Replace per-table FileLog watch threads with a single shared reactor
- Docs
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