clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Give each Merge child table its own PREWHERE filter DAG
- Iceberg OPTIMIZE rejects position-delete overwrite snapshots when deleted row count != delete file count
- Fix segfault in `expandOrderByAll` for a `Merge` child query
- Propagating `getArgumentsThatCanBeOnlyNull` through the combinators silently changes the result type and value of every pre-existing `<agg>If<Combinator>(x, NULL)` expression
- Docs: use regular functions overview as landing page
- Fix GCD codec behavior on signed values
- Add a dedicated thread pool for lightweight snapshot creation
- Check table name length on RENAME DATABASE unconditionally
- Fix missing materialized-CTE gate when a `Merge` table has several children
- Retry the job image pull so a registry reset cannot kill the whole job
- Docs
- C++ not yet supported