clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- NOT-wrapped float comparison with optimize_append_index drops matching rows
- Constraint `NOT (a < b)` reaches the comparison graph un-negated
- `SYSTEM DISABLE ALL FAILPOINTS` tests disarm the Stress job's fault injection
- Simplify the statistics cache
- Check thread never re-adds the part node: it detaches and re-downloads
- Inlined temporary view named by internal `_tmp_<uuid>`, not its visible name
- Streaming reads return wrong `_part_offset` for commit_order projections
- RESTORE fails with FUNCTION_ALREADY_EXISTS when a backup contains a UDF whose name is a built-in in the restoring version
- Keep Keeper sessions alive for local reads on followers
- Select the CRoaring set-bit extraction kernel at runtime in `BSINumericIndexedVector`
- Docs
- C++ not yet supported