clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Part check ignore query cancellation
- `DatabaseOverlay` swallows load errors: `EXISTS`/`RENAME` throw `LOGICAL_ERROR`
- Implicit min-max index reads stale files after a chain of RENAME COLUMN in one ALTER
- Iceberg: aggregates on a partition column read every row instead of using partition metadata
- `ssd_cache` with write buffer larger than the whole file hangs in `insertCell`
- Upgrade check: let the previous release re-attach the projections with positional arguments its tests create
- Do not lose the insert of `INSERT ... RETURNING` with a constant-false `JOIN`
- Analyzer: GLOBAL IN filter over UNION ALL of remote/Distributed reads drops the remote rows of every branch but the last
- Check the tables of a `Filesystem` database against the resolved `user_files_path`
- Push scatter exchanges below UNION ALL in distributed query plans
- Docs
- C++ not yet supported