clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Let `TwoLevelHashTable` choose its bucket count and bucket hash, and share one fixed-range table between buckets
- Re-implement IN to JOIN rewrite in the planner
- Fix privilege check bypass in text index transform expressions
- Make 02483_merge_projections and the 03460 projection tests independent of background merges
- docs: explain multi-topic Kafka ClickPipes ingestion
- Make DPsub the default join order algorithm, with the CD-C conflict detector
- Fix a window frame silently dropped when it precedes the parent window name
- Only `equals` conjuncts are merged into a JOIN condition, so a cross-table range comparison never reaches join planning: TPC-DS query_72 -86%
- Remove `use_compact_format_in_distributed_parts_names`, always use compact format
- `RIGHT JOIN` + `WHERE assumeNotNull(...)` loses all rows in both `WHERE p` and `WHERE NOT p` — query-plan optimizer honors a residual null-map after `assumeNotNull` strips it from the type
- Docs
- C++ not yet supported