clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Add processor memory delta to processors profile log
- Correlated subquery with `group_by_use_nulls = 1` and `WITH ROLLUP/WITH CUBE` causes logical error
- Fix SYSTEM SYNC MERGES hanging when a scheduled part does not exist
- Add lazy partition read option for in-order reading
- Improvements to keeper-utils analyze-snapshot
- Fix pipeline-stuck deadlock in BufferedShardByHashTransform
- Enable read_in_order_use_virtual_row by default
- Add sql compatibility super setting
- Track `MergeTree` metadata memory in async metrics
- Push down volume-reducing functions in query plan
- Docs
- C++ not yet supported