clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Stateless test: Timeout exceeded while receiving data from server. Waited for 300 seconds, timeout is 300 seconds.
- The uuid value replaces the macro in the system table
- Aggregator will have statistics about aggregated keys(min/max/any 100 values)
- User Defined Function (UDF) not working in ALTER TABLE UPDATE on ReplicatedMergeTree
- RESTORE hung (02907_backup_restore_default_nullable)
- mapElement, mapElementAll functions (as map specific analogue to arrayElement)
- Memory usage monitoring inconsistent with max_memory_usage_for_user configuration, resulting in memory limit exceeded error
- array() works for .inner_id. matetialized view, but doesn't work in mv with `to db.table` clause
- Support dynamic parameter adjustment for tokenbf_v1/ngrambf_v1 indexes based on false positive rate
- Adjusting Rollup Config of ReplicatedGraphiteMergeTree results in tables being readonly on restart
- Docs
- C++ not yet supported