clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Reduce per-block synchronization overhead in the pipeline executor
- Perf(Execution): Skip filtering for uniform filter masks
- Add an experimental UNPIVOT clause
- Fix the `_headers` virtual column's position, its cached-count value and a Hive key of the same name
- UnionNode still charges a subquery level: GLOBAL IN under a UNION needs +1 depth
- Build the deferred set of a column default that contains `IN <table>`
- Fix restoring a Field dump of a nested or quoted container
- Fix(Math): proportionsZTest for zero successes
- Persisted `timeSeriesData` table unreadable: LOGICAL_ERROR on every read
- Persisted `loop(db, t)` table pins its source: `DROP TABLE t SYNC` never returns
- Docs
- C++ not yet supported