clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- `multiMatchAny` silently drops all but one member of a negated character class (wrong results vs `match`)
- Store some typed paths in JSON in a shared structure instead of separate subcolumns
- `multiMatchAny`/`multiMatchAllIndices` silently miss `\p{P}` matches when the subject is 16-69 bytes
- Keep the PREWHERE filter column for evaluating defaults of missing columns
- Implement `applySettingsChanges` for `DatabaseReplicated`
- RFC: Existential LIKE over JSONAllValues — dedicated function vs arrayExists
- Filter push down through filtering step can break the query
- Build fewer temporary strings per key when parsing a JSON object
- Feat(PromQL): Implement /api/v1/status/buildinfo
- filesystem() with indexHint over a cheap column plus an ordinary conjunct on the same column fails with NOT_FOUND_COLUMN_IN_BLOCK
- Docs
- C++ not yet supported