clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Add the spilling mode of the partitioned hash join
- hasAnyTokens/hasAllTokens are not routed through tokenbf_v1, so a token search on a bloom-filter-indexed column reads every granule: 825 ms and 8M rows vs 111 ms and 655k
- Backport #119238 to 26.3: Don't use backoffs on concurrent inserts conflicts
- Many monotonic functions do not declare monotonicity, so `KeyCondition` cannot prune through them (`addDays`, `dateDiff`, `sqrt`/`exp`/`log`, `formatDateTime`, `toWeek`, `*OrDefault`, `greatest`/`least`, ...)
- `DateTime +/- INTERVAL n MONTH|YEAR` is not actually monotonic due to day clamping
- Password prompts (on install and in the client) shouldn't take ANSI escape sequences
- system.unicode notation values carry a trailing NUL (stale ColumnString layout)
- Cherry pick #120252 to 26.3: Fix out-of-bounds read on truncated compact `Variant` discriminators
- Cherry pick #120252 to 26.7: Fix out-of-bounds read on truncated compact `Variant` discriminators
- Fix CPU-slot acquisition latency and add ResourceRequest tracing (#11…
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- C++ not yet supported