clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Lazy pass re-locks StorageFile::rwlock: concurrent writer kills the SELECT
- Allow a COMMENT on a CONSTRAINT, and include it in the violation error
- Empty `LowCardinality(String)` optimization
- Default recent-samples table makes TRUNCATE on an all-external TimeSeries silently partial
- arrayElement NULL index returns the hidden nested value for Array/Map elements
- Real-time previews of query results
- Implement real-time previews of query results
- Short queries with many scalar subqueries are ~20% slower after AutoPR JOIN support
- PromQL rate/increase/delta/idelta/irate over native histograms
- Fix DeltaLake trivial count and total_rows over tables with deletion vectors
- Docs
- C++ not yet supported