clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Fix PromQL sgn() for NaN and negative zero
- Correlated-subquery decorrelation with in-memory buffer disabled: `Cannot clone ReadFromLocalReplica plan step` under parallel replicas
- Add JOIN observability columns to system.query_log
- Run the FileLog directory watch on its own thread
- Custom-key parallel replicas over a single-shard cluster set `distributed_group_by_no_merge = 2`, so the initiator never merges the per-replica aggregates
- Document snappy compression for file and object-storage I/O
- Bound the offset commit in the Kafka consumers
- Mixed JOIN `ON` condition over a dictionary with `join_use_nulls = 1`: wrong results, and a failed type-equality `chassert` in debug stress runs (STID 2508-2e0c)
- RANGE_HASHED dictionary with PostgreSQL QUERY source fails unless RANGE columns are selected immediately after key column
- Add range checks for narrowing VarInt reads
- Docs
- C++ not yet supported