clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- 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`
- Timezone-only MODIFY COLUMN bypasses the key-column ALTER guard: primary-key and partition pruning silently lose rows when the key is an expression over the column
- SYSTEM REFRESH VIEW during the RANDOMIZE FOR early window moves the schedule backwards and re-runs the completed timeslot, duplicating rows in an APPEND refreshable materialized view
- JSONColumns formats insert the type default instead of the DEFAULT expression for an explicit null under input_format_null_as_default
- Docs
- C++ not yet supported