clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Add new projection storage format
- ARM and AMD performance regression: `enum` query `2` is slower
- REFRESH on stopped or paused materialized view fires after START and only once even it's triggered multiple times, not out of order
- Log file is full with warnings after upgrade to 26.5 <Warning> BackgroundSchedulePool/BgMBSchPool : Temporarily pause scheduling of tasks with id <>, example log_name=StorageKafka
- Workload classification for moves
- Add Iceberg pruning details to `EXPLAIN` indexes
- Release pull request for branch 26.6
- Do not analyze `viewExplain` arguments before validation
- Array subscript operator supports array of integers as index.
- Propagate predicates across equi join
- Docs
- C++ not yet supported