clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Refactor `castColumn` and `FunctionsConversion`
- DnsResolver/Broken pipe when the cluster is running
- Hidden query parameters
- Nested LowCardinality does not engage low_cardinality_key_string for aggregations
- clickhouse-server 25.11.2.24 query planner causing wrong result when querying s3+external relational db
- Query condition cache doesn't work properly with `parallel_replicas_mode='sampling_key'`
- icebergS3 function (and table engine) high memory usage
- Support for Trimmed Mean Metrics
- Losing Data After upgrade when using Ceph volumes and no replication
- Dictionaries with executable source created via DDL fail
- Docs
- C++ not yet supported