clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- LATERAL join: support comma and `CROSS JOIN` forms, `arrayJoin` inside the subquery, and non-trivial `ON`
- Support correlated subqueries as the right-hand side of `IN`
- PostgreSQL compatibility functions: `string_to_array`, `split_part`, `array_length`, `random`, `to_timestamp`, `regexp_split_to_array/table`
- Cherry pick #128866 to 26.3: Fix silent Iceberg data loss on GCS parallel INSERT.
- Cherry pick #128866 to 26.8: Fix silent Iceberg data loss on GCS parallel INSERT.
- Cherry pick #128866 to 26.9: Fix silent Iceberg data loss on GCS parallel INSERT.
- Run the adaptive_aggregation_heavy_payload performance queries above 1 s on hits_10m_single
- Projection index: apply `max_projection_rows_to_use_projection_index` to the intersection of several projection indices, not to each one separately
- Projection index: stop reading projection bitmaps once their intersection is empty, and read the most selective projection first
- Fix `STRING_AGG(DISTINCT x, sep)` with a separator argument
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