clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Aggregation pushdown below JOIN in the Cascades optimizer
- Docs: add Managed Postgres replica lag notification
- Bound the shutdown wait for cancelled backups and restores
- Avoid overflow in the `uniq` aggregate function at cardinalities above ten billion
- Fix indefinitely waiting ReplicatedMergeTree startup after checkNoOldLeaders retries
- Undo non-transactional removal marks when `MergeTreeData::Transaction::commit` fails
- `MATERIALIZE STATISTICS` accepted with session `allow_statistics = 1` but executed with the server default — permanently stuck mutation when the profile disables statistics
- docs(clickstack): Add docs for dashboard variables
- Jemalloc Fragmentation Profiler
- Arrow: unsupported-types-as-binary fallback crashes on JSON/Dynamic columns
- Docs
- C++ not yet supported