clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- When you modify a table its materialized views execute scalar subqueries
- Incorrect mutation can easily produce inifinite CPU usage in a loop of retries
- Integrate scalar subqueries into query pipeline
- WIP Add parallel gz deflating buffer
- LIMIT BY optimizations.
- Qurying progress reach 99% and print all the result quickly，but reach 100% slowly
- Implicit type converts without warning when Insert a negative number to an unsigned field
- Support WASM plugins for UDF/TableFunctions/more
- Clickhouse doesn't show metrics during data ingestion.
- Play UI: better displaying of `Map` data type
- Docs
- C++ not yet supported