clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- UInt128 values are ignored in SELECT queries
- Support for materialize in minmax projection.
- Major performance degradation in group by with countDistinct since 24.9
- Alter freeze with transactions CANNOT_OPEN_FILE error
- Logical error: Part ... intersects previous part.... It is a bug or a result of manual intervention
- LOGICAL_ERROR: ColumnUnique can't contain null values (Analyzer + group_by_use_nulls)
- Insert resource limitation based on available memory
- The return type of FunctionIn is different between 21.8 and 24.4
- ClickHouse Kafka table ingestion shows non-distributed behaviour in a sharded + replicated setup.
- `Database _table_function does not exist`. When using remote() in subquery and Parallel replicas
- Docs
- C++ not yet supported