clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Count packed skip-index archive index loads, and assert 04653 on that counter
- Do not re-probe a PromQL selector that is known not to match a whole metric
- Account for rows read into the reverse read-in-order buffer
- Support hierarchical (dotted) database and table names
- GROUP BY CUBE/ROLLUP drops repeated grouping keys, losing grouping sets
- Support the standard GROUP BY set quantifier: GROUP BY DISTINCT (feature T434)
- Do not require `ALTER DELETE` for `ATTACH PARTITION FROM` and `CLONE AS`
- A `JSONAllPaths` skip index silently prunes all granules for a subcolumn under a typed `JSON` path with substructure
- Extend reading in reverse order with FINAL to Merge tables and topK through JOIN
- Read-in-order optimization returns wrong order (wrong rows under LIMIT) for a monotonically decreasing function of a Float sorting key containing nan
- Docs
- C++ not yet supported