clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Distribution queue grow and BackgroundDistributedSchedulePoolTask stuck
- Split AggregateFunctionTimeseriesHelpers.cpp: its object is at 93% of the 50 MB large-object gate on master, and over it with PromQL range functions
- DeltaLake writes: decimal partition value committed without scale (`1.5` for `decimal(10,2)`), the table is then unreadable by ClickHouse and delta-rs
- The tokenbf_v1 granule probe ANDs whole bloom filters per needle: 32-needle multiSearchAny 942 -> 782 ms, and 1477 -> 906 ms with 128 KiB filters
- Cover the remaining hash join uses with the partitioned hash join
- Bound a window's sort per partition when a rank() filter above it caps the rank
- Reject a schema inference result whose every column name is empty
- Fix UB in DateTimeTransforms
- Refactor hash join to give each ON disjunct its own `HashJoinTable`
- Run joins with several ON disjuncts on the partitioned hash join
- Docs
- C++ not yet supported