clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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Help out
- Issues
- Speed up Map key lookup for LowCardinality keys
- Read the DEFAULT inputs of a patch part's sorting key columns
- Feat(Aggregate): Add `product` aggregate function
- Skip a group's key materialization when a HAVING count() bound already rejects it
- Account for initial query context memory
- perf(promql): Cache identical TimeSeries metric family inserts.
- Break a PromQL topk/bottomk tie by the series, not by the read order
- Add Delta Lake write tests: writer features, failpoints, evolution, grants, STS
- Add column scatter kernels and run/chain tags for `RowRefList`
- Sibling aggregate scalar subqueries over the same tables are executed one at a time: answering the group with one scan is 70% faster on TPC-DS query 9
- Docs
- C++ not yet supported