clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- sumMap() is slow and LowCardinality doesn't help
- CANNOT_READ_ARRAY_FROM_TEXT when importing array dumped from Postgres
- ProfileEvents for number of rows in GROUP BY, DISTINCT, ORDER BY, IN, and JOIN states.
- System table with list of named connections
- huge performance impact when order by PK prefix
- values() table function with Float32 column: Cannot convert value X from Float64: it cannot be represented as Float32.
- [MaterializedPostgreSQL] Use Date32 and Datetime64 by default
- Relative path is not supported for config path in clickhouse-server daemon mode
- Combinatorics functions (on arrays)
- Query Multiplexing
- Docs
- C++ not yet supported