clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Stop and start merges, moves, TTLs and views in stress tests (merging when the CI gets green)
- `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 stale MATERIALIZED column values read through a chain while a mutation is pending
- Fix NO_SUCH_COLUMN_IN_TABLE naming a column absent from the table when a part's columns were all renamed or all dropped
- Add `/dialect`, `/lang`, `/language` client commands
- Fix the bit-sliced full adder in `groupNumericIndexedVector`
- [RFC] Add most-common-values (`mcv`) column statistics for better equality/IN selectivity on skewed columns
- Mongo queries: keep whole documents in a JSON column
- Docs
- C++ not yet supported