clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- If ZooKeeper is unreachable, querying the `system.zookeeper` table never finishes
- VersionedCollapsingMergeTree with FINAL and filtering - wrong result?
- -At combinator for aggregate functions to generate an array of aggregates.
- Integration of LightGBM and XGBoost into ClickHouse
- Optimization limitations of SEMI JOIN with empty table
- Optimization limitations of ANTI JOIN with empty table
- getMacro() on remote() table not working (instead is querying local macros)
- Fetching LowCardinality column with lazy materialization can throw exception.
- Specialize sparse and low cardinality behaviour for `equals` and `notEquals`
- Misleading error message about an unknown identifier
- Docs
- C++ not yet supported