clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- LIMIT BY blocks limit pushdown even when its keys match the sorting key and input is read in order (100x read amplification for top-N-with-dedup)
- query_plan_execute_functions_after_sorting makes lifted expressions single-threaded, slowing down ORDER BY without LIMIT
- Backport #111442 to 25.8: Fix checking paths against `user_files`
- Backport #112596 to 26.6: Bump `libcotp` from v3.1.1 to v4.2.1
- Backport #112596 to 26.7: Bump `libcotp` from v3.1.1 to v4.2.1
- Backport #112595 to 25.8: Bump `jwt-cpp` from v0.7.0 to v0.7.2
- Backport #112595 to 26.5: Bump `jwt-cpp` from v0.7.0 to v0.7.2
- Backport #112595 to 26.6: Bump `jwt-cpp` from v0.7.0 to v0.7.2
- Cherry pick #112594 to 25.8: Bump `simdjson` from v4.2.4 to v4.6.5
- Cherry pick #112593 to 25.8: Bump vendored `libexpat` from 2.8.1 to 2.8.2
- Docs
- C++ not yet supported