clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Analyzer: GLOBAL IN filter over UNION ALL of remote/Distributed reads drops the remote rows of every branch but the last
- Check the tables of a `Filesystem` database against the resolved `user_files_path`
- Push scatter exchanges below UNION ALL in distributed query plans
- Decode Parquet columns densely after a scattered PREWHERE when the file has a page index or NULLs
- Merge cross-side range predicates from WHERE into the JOIN condition
- Skip Iceberg data files by JOIN runtime filters
- JOIN runtime filter: prune probe-side granules when the probe key is arrayJoin of an indexed Array column
- Planning time grows quadratically with the number of ALIAS columns read
- Propagate the load error of a table in `waitTableStarted` of `DatabaseOverlay`
- Read the marks between two overlaps of FINAL without merging
- Docs
- C++ not yet supported