clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Iceberg: reuse parsed state and derived storage metadata
- Parquet: share cached footer metadata between readers
- PromQL arithmetic operators and sum/avg aggregation over native histograms
- Make per-key duplicate-key bookkeeping cheaper when parsing JSON objects
- Bump the bundled ORC library so an unknown ORC compression codec does not abort
- Fix FunctionDynamicAdaptor exception when nested function returns Nothing type
- TEST: demonstrate sccache low-hit-rate warning in CI report
- MATERIALIZE PROJECTION is a no-op after MODIFY PROJECTION, contrary to PR docs
- Aggregate single-dictionary `LowCardinality` keys by index
- Make hash tables agree with equals on negative zero
- Docs
- C++ not yet supported