clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Make CPU-bound `work()` interruptible: large single chunks block `KILL QUERY` / timeouts
- Logical error: 'current_version != existing_version' (STID: 2508-3ef8)
- Add `query-analyzer` util for profiling query analysis
- Improve text index condition description in `EXPLAIN`
- Keeper: SIGABRT (LOGICAL_ERROR in commit_in_bg) on every reconfig+restart during quorum migration on 25.8 — regression of #72234?
- Fix "No set is registered for key" for a subquery used as both FROM source and IN argument
- Add infrastructure for top-K search queries and `vectorSearch` table function with support of the prefiltering
- Logical error 'Unexpected return type from toString' in correlated subquery decorrelation with WITH ROLLUP and group_by_use_nulls
- ALTER TABLE ... ENGINE = ...MergeTree
- Performance: ~7x peak memory for aggregate queries with a PREWHERE filter over wide String columns since 26.2
- Docs
- C++ not yet supported