clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- New engine check blocks `Replicated` replica recovery for stored `File` tables
- Search Parquet PLAIN string pages in bulk for a pushed-down substring filter
- parseDateTime `%F`/`%D` still accept non-digit month/year
- parseDateTime wraps DateTime values past 2106-02-07 06:28:15 to 1970
- parseDateTimeInJodaSyntax adds 12 hours twice for PM when format has `a` and `z`
- Implement `SYSTEM STOP/START REPLICATED DDL QUERIES`, `VIRTUAL PARTS UPDATE`, `REDUCE BLOCKING PARTS`
- Add `access_control_improvements.throw_on_ambiguous_user_or_role_names` to refuse a name that is both a user and a role
- Query cache can store a sorted subquery result unsorted, losing ORDER BY
- Support `COLLATE` in the `GROUP BY` top-K optimization
- Make query_plan_push_down_expressions_below_window never worse than the current analyzer
- Docs
- C++ not yet supported