clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Open a skip index's substream files only when they are read
- Split AggregateFunctionTimeseriesHelpers.cpp: its object is at 93% of the 50 MB large-object gate on master, and over it with PromQL range functions
- Fix access checks in PREWHERE and indexHint() that used aliases
- Let a text index reader serve incomplete granules
- DeltaLake writes: decimal partition value committed without scale (`1.5` for `decimal(10,2)`), the table is then unreadable by ClickHouse and delta-rs
- DeltaLake writes: `add.stats` is committed as `{"stats_json":"..."}`, so no reader sees `numRecords`
- 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
- Compute one-bit QBit distances from the packed sign plane, with an optional Hamming-distance mode
- `full_sorting_merge` rejects LowCardinality key rewritten to `toNullable`
- Docs
- C++ not yet supported