clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Squash source blocks before projection calculate to reduce temp parts
- Add testcases for default columns
- Add parallel_replicas_prefer_local_replica setting
- Add SQLStorm CI job
- Fix distributed task iterator not initialized exception with parallel replicas
- Check table failed if a JSON column has too complex structure
- Fix signed integer overflow in toStartOfInterval for Millisecond/Microsecond intervals
- Truncate ORDER BY after all GROUP BY keys are covered
- Idea: diagnose tests failed due to randomized settings.
- Optimize tupleElement(dictGet(..., tuple_of_attrs), N) into single-attribute dictGet
- Docs
- C++ not yet supported