clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Assume Float columns to be distinct, do not build implicit uniq statistics
- Do not prefetch small corners in parquet reader
- Ignore parallel_replicas_allow_in_with_subquery under plan-based parallel replicas
- perf(promql): Read only the needed tags columns for Prometheus label metadata.
- Use signal-tolerant sleep for AWS retry backoff
- `NOT_FOUND_COLUMN_IN_BLOCK` with `query_plan_optimize_lazy_final` on a partitioned table with patch parts
- WIP: Use a threadpool to send tasks to workers in distributed plan
- Fix default expressions that read a subcolumn of an EPHEMERAL, ALIAS or omitted column
- Fix logical error in `PruneArrayJoinColumnsPass` for a `Nullable` or `USING` ARRAY JOIN reference
- `Merge` over data lake child throws `LOGICAL_ERROR` after column type widening
- Docs
- C++ not yet supported