clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- `Nullable(DateTime64)` precision check skipped due to `getDataType()` returning `TypeIndex::Nullable`
- Transform JOIN hash table payload to row major
- RFC: per-query cancellation event hub; faster, more uniform cancellation across the codebase
- Make `finished_mutations_to_keep=0` mean "keep no finished mutations"
- feat(promql): Allow Prometheus handlers to target TimeSeries tables via HTTP headers.
- `RestCatalog::empty` returns inverted result - true when catalog has tables, false when empty
- `jodaMicrosecondOfSecond` reads more fractional digits than scale indicates, causing wrong DateTime64 values
- Arrow Flight:Parameterised queries
- Implement a `SELECT_NULL` privilege in RBAC
- Non-existent user/group names in `clickhouse-su` silently resolve to uid/gid 0 (root) instead of erroring
- Docs
- C++ not yet supported