clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Cache the streams of columns in the Wide part writer
- Array-returning h3/s2 functions throw on NULL in Nullable(UInt64) cell column
- `IS NULL` on a settings-diverged key expression prunes every granule
- Rewrite correlated scalar aggregate subqueries into window functions
- Apply a classifier to decide if we should skip Performance Comparison in a PR
- Do not push a filter into an external table on the non-preserving side of a nested outer join or on the side an ANY or ASOF join picks from
- Materialized CTE with many small blocks has high transfer overhead
- Add experimental `aiRelevance` function
- UNION ALL constant branches collapse -0.0 and 0.0 to the same value
- Merge the `HashJoin` helper into the partitioned hash join and name it `HashJoin`
- Docs
- C++ not yet supported