clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Report the real reason when the settings-history diff fetch fails
- Back off exponentially when the GitHub API returns 5xx or 429
- Reading an object storage table in order can return unsorted rows
- Query planner stuck for hours in bloom_filter index analysis when WHERE references a large scalar subquery Map, query cannot be killed
- Reject malformed compressed Arrow IPC buffers before allocating for them
- Add `sorted_merge` and `parallel_sorted_merge` join algorithms
- Refreshable MV: apply `RANDOMIZE FOR` per replica
- Use `pread` when `preadv2` with `RWF_NOWAIT` cannot be used, and recognize `EPERM` from it
- Allow low cardinality types in iceberg and improve perfomance of low cardinality in parquet
- Reapply "Make `postgresql` and `PostgreSQL` engine work against a ClickHouse instance", with a fix for the cancel-request logical error
- Docs
- C++ not yet supported