clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Replace collision-chain eviction with global LRU in
- Add experimental LATERAL JOIN support
- Validate IN tuple/subquery column count mismatch in analyzer
- Introduce statistics-based disabling of join runtime filters (#96095)
- Query type is ExceptionBeforeStart but memory_usage > 0 with multiple threads
- Add ARM SVE infrastructure and SVE-optimized paths for unary arithmetic and findExtreme
- collect profiles event for part_log
- Push join key filters into MergeTree index during recursive CTE evaluation
- PR: use serialized query plan - part 2
- Window function parallel evaluation can be a problem sometimes
- Docs
- C++ not yet supported