clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Improve Bloom-filter pruning for wrapped `arrayJoin` IN predicates
- Do not forward a Merge destination's processing stage across an order-breaking type conversion in a Buffer or a materialized view
- Check for query cancellation while the analyzer hashes query trees
- Read a subcolumn of a Hive partition column from the path
- Reopen a bounded S3 read whose response ends before the right bound
- Merge chains of `has` and `hasAll` on one array into `hasAny` so a text index answers them once per block
- Schedule all parts of a query as one query in workload scheduling
- CI: plan to move AWS access from job containers to the runner host
- Keep bloom_filter pruning for hasAll with a zero and for float arrayJoin equality
- The insert throttling check walks all active parts of the table under the parts lock on every insert
- Docs
- C++ not yet supported