clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- `addDays`/`addWeeks`/`subtractDays` on UTC `DateTime64`: 14% slower on aarch64
- Fix Kafka engine statistics: broken default and StorageKafka2 override
- Raise the per-type task limit of a background schedule pool when its size is increased at runtime
- Cherry pick #117754 to 26.3: Split an oversized chunk across several Arrow record batches
- Cherry pick #117754 to 26.8: Split an oversized chunk across several Arrow record batches
- Cherry pick #117754 to 26.9: Split an oversized chunk across several Arrow record batches
- Cherry pick #117754 to 26.10: Split an oversized chunk across several Arrow record batches
- Cherry pick #122494 to 26.9: Run the user-limit case of the external `DISTINCT` ratio test at 4 GiB to fit the ASan query timeout
- Transitive join filters are propagated to some tables but not others, causing full scans and massive hash join spill
- Single node EXPLAIN PLAN tree = 1: draw plans as boxes
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