clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- `numericIndexedVectorPointwiseDivide`/`Multiply`: a result that rounds to zero silently drops the index from the vector instead of storing an explicit 0
- Decimal source skips DateTime64/Time64 saturation: out-of-range ticks stored
- age() off by one: ns overflow flips the sub-unit adjustment past 2262-04-11
- Subquery SETTINGS clause makes auto parallel replicas throw LOGICAL_ERROR
- `icebergTruncate` writes a spec-wrong partition value for negative integers — filtered reads silently return 0 rows for existing rows
- toRelativeHourNum is non-monotonic at the Unix epoch for DateTime64 but reports is_always_monotonic — partition pruning and PK analysis silently drop rows
- skipPosixNamedClass at a range upper bound: `[0-[:` eats the class end
- skipPosixNamedClass rescans the whole pattern per `[:` — analysis is now quadratic
- dateDiff('week') and age('week') undercount by one across the Unix epoch: truncating division in toRelativeWeekNum for in-LUT pre-epoch dates
- Check a part's own consistency even when one of its projections is broken
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