clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Add tests for `make_distributed_plan` defects found by stress-testing the local-execution fallback
- Add OverwriteCache table engine
- Workload CPU scheduler: high per-query latency under concurrency from serialized slot acquisition
- A mutation writes an unreadable Compact part when adaptive codec selection meets shared per-granule compression
- Do not convert a column a pending mutation drops
- Fix column names of `untuple` inside a SQL UDF called with an alias
- OOMCanary permanently disables all merges and mutations after one firing: MergeList::cancelAll became sticky with no reset (regression in 3e1b29bef473)
- Analyzer: the `view` table function interprets its body twice
- AsyncLoader/ProcessList: `max_waiting_queries` limit is never enforced (incomplete/dead code)
- `count()` over a `Tuple` float primary key counts every row when the comparison constant holds a `nan` — no `nan` in the data required, the constant-side guard misses tuple-nested floats
- Docs
- C++ not yet supported