clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Do not delete rows whose TTL is 0 when the rest of their part has expired
- AI code review: prefetched context, Loom code index, validated publishing
- MATERIALIZE TTL fails: mutation header lost the GROUP BY key expression column
- Under concurrent inserts, every query reloads column statistics sequentially from object storage under the parts lock: 1.3 s query takes 34-44 s
- age loses a unit on Date/Date32 when DST skips the start date's midnight
- Correlated EXISTS with a non-equi or OR condition is planned as DISTINCT plus two joins instead of one semi join: 2-7x memory
- Add `query_plan_join_shard_by_partitions`: execute JOIN partition by partition
- Per-subquery SETTINGS storage limits are lost in a shipped query plan fragment
- PostgreSQL onCancel blocks shared CancellationChecker thread for ~2 minutes
- `INSERT SELECT` local-pipeline gate ignores the SELECT's own `SETTINGS`: SIGSEGV
- Docs
- C++ not yet supported