clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Server-wide hang after `DROP WORKLOAD` with split MASTER/WORKER CPU resources
- Different SELECT expressions with the same output label are rejected
- Apply `-WithMemoryTracking` containers to `src/Processors/Formats`
- hasAll/hasAny on short arrays scan fully with no early exit on ARM
- Fix hangs of distributed `INSERT`, `GLOBAL IN` / `GLOBAL JOIN` and `file()` reads in a workload with few CPU slots
- Do not take the parts snapshot of a materialized view's source table during analysis
- Stop reading input in aggregate-free `GROUP BY ... LIMIT` once enough keys are found
- performance regression: small GROUP BY converts to two-level aggregation on 26.8 because the threshold counts whole-query memory
- Feat(DateTime): Support `%U` in `formatDateTime`
- Fix a hang of `remote()` queries with `async_socket_for_remote = 0` in a CPU workload
- Docs
- C++ not yet supported