clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Write one dictionary per merged part for `LowCardinality` columns with a few times more distinct values than `low_cardinality_max_dictionary_size`
- Analyze the `Distributed` sharding key again after `ALTER TABLE ... MODIFY COLUMN`
- Do not re-run query tree optimization passes on Merge child plans
- Allow only the address families the server uses in the seccomp policy
- Build with `-fzero-call-used-regs=used-gpr`
- Request the rest of the range when an HTTP positional read gets a partial response
- Do not treat a terminated server whose pid still exists as running in `clickhouse stop`
- Preserve probe parallelism when hash join is selected below threshold
- Resolve Iceberg manifest entry fields without enumerating the whole manifest schema
- Add lexicographic Keeper list pagination with start_after
- Docs
- C++ not yet supported