clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- `isInlineFlagGroup` misses `(?)`: `replaceRegexpAll('xfx', '^(?)?x')` -> Zfx
- replaceRegexpAll wrongly rewrites to single replace for `^(?)?x`
- `LIMIT n BY ALL` keeps aggregate columns as keys with `group_by_use_nulls`
- LIMIT n BY ALL re-reads view constants on local replica: wrong rows or Code 36
- Row policy/filter subquery mishandles positional args on local replica
- perf(promql): aggregate range vector functions in the order of the samples table, split by primary key ranges
- FINAL without rescoring returns stale row versions in vector search
- Speed up the `-Distinct` combinator for integer keys
- Partition pruning skips matching parts for a `Tuple` key with a `FixedString` element
- Use the SIMD IPv4 parser in `toIPv4` from `String`
- Docs
- C++ not yet supported