clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Query-level SETTINGS drops a reset of a setting also assigned in the same clause
- Subquery SETTINGS clause skips SettingsConstraints: readonly and profile caps escapable
- CapnProto import scanner loses `import` across a comment; deep schema still SIGSEGVs
- Fix early short-circuit fallback for IN subqueries
- Patch merge spans a running merge's data version on MergeTree: LOGICAL_ERROR
- Window functions cannot reuse a descending sorting key: `PARTITION BY` always asks for `ASC`, so `ORDER BY (a DESC, b)` loses read-in-order
- Stop S3 retries when MergeTree merges or mutations are cancelled
- Add `SQL SECURITY` (INVOKER/DEFINER) to the `Alias` table engine
- Share the `GROUP BY` top-K skip boundary between aggregation threads
- `GROUP BY` top-K optimization should support permuted and subset `ORDER BY` keys
- Docs
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