clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Do not claim `toStartOfInterval` and `dateTrunc` are monotonic over a `Date32` range they wrap
- Convert the Parquet PREWHERE filter to a bitmask once per call when decoding dictionary indexes
- Skip Parquet row groups by their dictionary for `ORDER BY <String> LIMIT` when the filter rejects the empty string
- Fix a data race on the gRPC output buffer with the `Pretty` squash thread
- Memory table read estimate ignores WHERE/PREWHERE, causing bad join swap
- Write `JSON` shared-data values as text without a temporary `Dynamic` column per value
- Read the next small Parquet row group ahead from object storage with at least as many streams as `max_download_threads`
- Do not drop unreferenced dictionary values in Parquet PREWHERE when the condition cannot throw
- Share one delta-kernel engine per `DeltaLake` table and cap its idle connections
- GROUP BY on a prefix of the sorting key: aggregate one-value blocks and long key runs through the constant-key path (ClickBench Q27 -7%, GROUP BY EventDate -47%)
- Docs
- C++ not yet supported