clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- If the index expression can't be false on a granule, treat it as `1` to avoid recalculation
- Extra metrics to introduce in ClickHouse
- Optimization of Top-K query processing for Merge tables
- Try to squeeze some more devirtualization
- backup .zip default deflate is really slow
- Drop table on keeper map does not clean out the keeper path before returning
- Allow multiple key condition atoms per predicate leaf
- Proper DateTime saturation to the start of Unix, considering local timezones
- Backport #96172 to 25.3: Fix query condition cache hash collision for CTE folded constants
- Backport #96172 to 25.8: Fix query condition cache hash collision for CTE folded constants
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- C++ not yet supported