clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- `GROUP BY` top-K optimization should support `ORDER BY` on expressions of the keys
- `ttl_only_drop_parts`: avoid reading fully expired parts when TTL admission falls back to `RegularMerge`
- Add iceberg setting to avoid object storage metadata request for data files
- `clickhouse-test`: a per-test timeout in a parallel worker kills the whole run and it is reported as `Server died`
- Enum-keyed Map indexed by a Nullable name throws on NULL keys instead of returning NULL
- Lightweight updates from the 26.8 patch_parts_version=v2 window are silently lost after upgrade: patch parts detached as broken-on-start, queries return pre-update data
- Catalog data type hints
- S3Queue/AzureQueue re-ingests every file after restart: a transient Keeper error makes registerNonActive misattribute metadata creation and wipe the processed-files registry
- WATERMARK expression over an ALIAS column passes validation, then throws UNKNOWN_IDENTIFIER
- Keeper can lose acknowledged writes after power loss: no directory fsync on changelog segment creation/rotation (and cross-disk move) in src/Coordination
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