clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Cherry pick #106466 to 26.5: Add `GlobalMemoryLimitExceeded` profile event
- Primary key index is not used when the key expression `toStartOfInterval(a, toIntervalSecond(N))` is written explicitly in WHERE (constant-folded argument breaks `KeyCondition` matching)
- Add query plan cache for complex queries (views, joins, subqueries)
- [RFC] Compact, index-based row references for the hash join and exact-size parallel_hash build
- nullIf(key, sentinel) predicates build no key range — primary key / partition / skip indexes not used (mirror of #94754)
- Explain rejected skip indexes
- MaterializedPostgreSQL: prevent exported snapshot expiration during initial sync
- 'CREATE TABLE AS SELECT FROM s3Cluster' does not work in 'Replicated' database
- Recursive CTE: squash chunks before writing the intermediate table
- Support materialized CTEs in recursive WITH
- Docs
- C++ not yet supported