clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Implement Postgres `regexp_instr` function in ClickHouse
- Iceberg: Optimize JSON metadata parsing by improving string replacement
- Fix race in MergeTreeTransaction::afterCommit between state publish and part CSN update
- Optimize `LIMIT BY` by pushing down `LIMIT BY` into `Sort`
- Support Virtual Columns in Per-Part MinMax Index
- support three-valued logic in SelectivityEstimator
- Fix `FunctionsStress.stress` abort when a worker thread gets stuck
- Preserve SettingFieldMaxThreads::is_auto across SET <name> = DEFAULT
- `canConvertTo<size_t>` returns true for `x = 2^64` because `Float64(SIZE_MAX)` rounds up to `2^64`; subsequent `static_cast<size_t>` is UB
- Add test: `input_format_force_null_for_omitted_fields` throw branch in `JSONColumnsBlockInputFormatBase` untested for `JSONColumns` / `JSONCompactColumns` / `JSONColumnsWithMetadata`
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