clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Support `UNIQUE(subquery)` predicate that tests for no duplicate rows
- Support `MATCH` predicate for referential integrity checks in queries
- Support `SET TIME ZONE INTERVAL '±hh:mm' HOUR TO MINUTE` and `SET SESSION CHARACTERISTICS`
- `EXECUTE AS` fails for LDAP users that have not logged in since server restart
- Add Arrow Flight interface documentation
- [WIP] Add backup engine URL()
- Support LIMIT 0 or LIMIT n OFFSET m in correlated subqueries
- Sharded Aggregation for high cardinality data
- perf: Prune parts for `ORDER BY LIMIT` queries on partitioned tables when `optimize_read_in_order=1`
- Use blocked Bloom filter for join runtime filters
- Docs
- C++ not yet supported