clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Having only a single part in the table may slow everything down
- Irrecoverable issue while loading metadata.
- Support reading ORC file in parallel
- ClickHouse randomly getting stuck during the "Access granted" stage
- Implement Write Ahead Log for System logs
- windowFunnel strict_increase doesn't behave correctly if there is chain with events with the repeating subchain
- Implement geo-location awareness during fetching
- ClickHouse Kafka Engine Consumers getting into frequent PreparingRebalance state
- Allow creating `Overlay` databases
- Support specify number of nominal entries in datasketchs `uniqTheta`
- Docs
- C++ not yet supported