clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- GROUP BY push down optimization
- bloom filter as aggregate function
- groupArray cpu utilization rate is low
- Network replay server for testing
- PREWHERE optimizer does not work properly for MV
- Can't execute SELECT query with readonly=1 and GLOBAL subquery
- ALTER TABLE COMMENT COLUMN for Materialized View with ReplicatedAggregatingMergeTree engine doesn't propegate to all replicas.
- Partition prune should work when only partition columns used in a udf in where condition
- Implement a way to ALTER unreplicated tables ON CLUSTER with internal_replication=true
- Performance optimization: getColumnNameWithMinumumCompressedSize not always needed
- Docs
- C++ not yet supported