clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- 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
- Filter push-down drops an always-NULL HAVING conjunct that depends on an aggregate: `HAVING 7 AND (max(c0) + NULL) AND 65535` passes every group (regression since 26.3)
- `STREAM BOUNDED CURSOR` read reports rows to `count()` but returns no column values (`sum`, `GROUP BY` and aggregate states answer as if the table were empty)
- Zero-length `columns_substreams.txt` after power loss detaches the whole Wide part and silently loses acknowledged rows (missing file is safe, empty file is fatal)
- Zero-length or missing `ttl.txt` after power loss detaches the whole part and silently loses acknowledged rows, although TTL infos are recomputable derived data
- A function throws for a row whose result is NULL, when the payload under the null map is a value it rejects (`match` with an invalid regular expression, `hasToken` with a separator)
- Skip index over a Map column `j.m` wrongly prunes granules when the predicate reads a JSON dynamic path `j.m.key_<k>` of a sibling JSON column `j`
- `tupleElement` default argument referencing an `ARRAY JOIN`-ed `Nested` subcolumn: `PruneArrayJoinColumnsPass` prunes it, causing silent wrong results or `BAD_ARGUMENTS`
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