clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- DeltaLake writes: `add.stats` is committed as `{"stats_json":"..."}`, so no reader sees `numRecords`
- DeltaLake writes: unparsable string into a nullable integer column is committed as NULL instead of failing
- 26.8.3.105 amd64: startup SIGILL at BLSR on CPU without BMI1; 26.3.9.8 works
- 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`
- A selective HAVING count() bound is applied after every group key has been materialized: pre-filtering the aggregated-output conversion is 16% faster on TPC-DS query_23
- Do not build a has set atom for a key side whose type hides the value type
- Fix `TYPE_MISMATCH` for a `LowCardinality` join key under `join_use_nulls` with `full_sorting_merge`
- Docs
- C++ not yet supported