clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Do not read the client's stdin again after a read from it failed
- GROUP BY ... ORDER BY count() DESC LIMIT n with another aggregate over a repetitive key runs 2x slower on the adaptive aggregator: let frozen tables thaw under the top-K pruning (Title count+min top-10 -53%, peak memory -63%)
- Build with `-fsanitize=return` in trap mode
- System log flushes use memory overcommit instead of failing at the server memory limit
- ExecutablePool returns stale reply after LIMIT 0 / WHERE 1=0 query
- Rebuild projections that compute from a column whose type `MODIFY COLUMN` changes
- Reject `input` in `INSERT ... RETURNING`
- Add `arrayTreePreorder` function
- Interpret `DateTime` literals of a table `TTL` in the session time zone
- Cached join stats pick `hash` over `parallel_hash` on repeat runs, losing parallelism after remote reads
- Docs
- C++ not yet supported