clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- [CI crash] Failed to validate version metadata during data part load
- [26.3.9.8] Subquery over clusterAllReplicas returns different results depending on selected outer columns
- `checkLimits` uses conservative `total_size` for `system.numbers` causing false `TOO_MANY_ROWS` with LIMIT
- Add tests for best-effort parsing of microsecond and nanosecond Unix timestamps
- `tryMakeDirectJoinWithMergeTree` accepts `ReadFromPreparedSource` which lacks `clone`, causing `NOT_IMPLEMENTED` exception for Buffer tables
- Push equi-key filter into the left input of RIGHT JOIN for cross-type USING keys
- `cast_keep_nullable` fails to preserve nullability when target type is `LowCardinality` because `canBeInsideNullable` returns false for LC types
- ClickHouse Client: Autocomplete could be context-aware
- syntax incorrect queries leak "insert"/secure credentials body in system.query_log/logs
- Skip granule-level minmax index when the part-level minmax already covers it
- Docs
- C++ not yet supported