clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- CHECK TABLE returns 0 instead of failing when the check is aborted by a partial shutdown (Keeper session loss) — a false corruption alarm on healthy data
- Do not run the server-side AST fuzzer on a collaborative worker context
- Perf(PromQL): Optimize PromQL unless for exact groups
- Column comments are not taken during create distributed table
- Resolve the default time zone from an absolute `TZ` path outside `TZDIR`
- Cascades node count still re-read from ambient context; subquery SETTINGS rejected
- Fix `minmax` skip indexes, primary key and partition key not used when the analyzer rewrites the filter expression (e.g. for ALIAS columns)
- readonly>0 does not restrict SET ROLE
- Use PREWHERE for filters pushed down into JOIN sides
- Size integration test workers from the job cgroup limit instead of host RAM
- Docs
- C++ not yet supported