clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Enable independent per-partition DISTINCT when partition key matches DISTINCT columns
- RFC: Keyed recursive CTEs (settled-set semantics for graph traversal in recursive queries)
- 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)
- AddressSanitizer: CHECK failed: sanitizer_allocator_secondary.h:199 "((nearest_chunk)) >= ((h->map_beg))"
- MaterializedPostgreSQL: prevent exported snapshot expiration during initial sync
- Recursive CTE: squash chunks before writing the intermediate table
- Support materialized CTEs in recursive WITH
- Recursive CTE: experimental USING KEY (keyed recursion / semi-naive evaluation)
- Fix/cluster discovery keeper exception
- Docs
- C++ not yet supported