clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- allow_ddl option is not consistent over restarts
- Directory for table data [...] already exists on replicated table in case of disk failure
- Atomic inserts (on parts level) to main table and all dependant Materialized views
- ARRAY JOIN with LIMIT BY can be optimized
- Input formats: save unknown fields to a special column instead of skipping
- Dictionary does not know LowCardinality(String)
- Optimize boolean conditions using CNF / DNF
- GROUP BY push down optimization
- bloom filter as aggregate function
- groupArray cpu utilization rate is low
- Docs
- C++ not yet supported