clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Lazy-load part-level column statistics
- Logical error: Invalid number of columns in chunk pushed to OutputPort. Expected A, found B (STID: 2270-3258)
- Fix join NDV propagation for distributed aggregation
- Support quoted PromQL grouping labels
- Fix DPsub join reordering silently dropping single-table ON-clause filters
- Add a `string_bounds` column statistic for String columns
- `PREWHERE <bare column>` with `FINAL` throws THERE_IS_NO_COLUMN when PREWHERE is deferred after FINAL
- Optimize merges of the text index
- Use actual codec to estimate compressed column sizes for dataflow statistics
- Fix NO_SUCH_COLUMN_IN_TABLE naming a column absent from the table when a part's columns were all renamed or all dropped
- Docs
- C++ not yet supported