clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- `arrayAUCPR` returns NaN when scores array contains NaN due to `nan != nan` comparison triggering premature area calculation
- `checkAllowedQueries` early return bypasses validation of PREWHERE/SAMPLE/FINAL in later UNION branches
- `buildSelectIntersectExceptQuery` missing `aliases` parameter causes CTE column aliases to fail for INTERSECT/EXCEPT queries
- `indexOfAssumeSorted` returns wrong results for `Array(LowCardinality(String))` due to binary search on dictionary indices
- `setSecondArgumentAsParameter` discards all existing function parameters including limit
- `isEnum(to_type)` check in `SetUtils.cpp` doesn't handle `Nullable(Enum)` wrapper
- `toFloat64`/`toUInt32`/etc. on `Dynamic` ignores `cast_keep_nullable`, converting NULL to 0 instead of returning NULL
- Add custom settings to 'system.disks' table
- `getReturnTypeImpl` doesn't filter NULL types when `legacy_null_behavior=false`, causing type error
- `updateHashFast` missing `version` parameter causes hash inconsistency for versioned aggregate functions
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- C++ not yet supported