clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Check the memory limit after flushes of untracked memory that skip it
- Add `arrayTreePreorder` function: DFS preorder layout of a tree stored as (id, parent_id) arrays
- Use the top-K dynamic filter for `ORDER BY` of a single `LowCardinality(String)` column
- Report `NOT_IMPLEMENTED` instead of a logical error when a `Buffer` table cannot read a codec subcolumn from its unflushed rows
- Refuse the `Quantized('product')` codec in `Log` and `TinyLog` tables
- Improve `sccache` to reuse S3 artifacts as cold read-only cache
- make_distributed_plan: how should we handle replica part divergence when scheduling read buckets?
- Speed up `-ForEach` over arrays of `Nullable` values
- Join the time ranges table with `ANY` in the `TimeSeries` selector
- Expand groups with the literals around them in PromQL regex matchers
- Docs
- C++ not yet supported