clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- `expandLimitByAll` missing `hasWindowFunctionNodes` check causes LIMIT BY ALL to include window functions
- `consumeTotals` and `consumeExtremes` don't reset `displayed_rows`, hiding Totals/Extremes when `max_rows` is reached
- Iceberg: 'c.null' subcolumn missing for schema-evolved column when optimize_functions_to_subcolumns=1 (default)
- Vector search: rewrite PREWHERE cosineDistance() to reference the _distance virtual column instead of disabling the no-rescoring optimization
- Support Nullable(Array)
- Fix `NOT_FOUND_COLUMN_IN_BLOCK` in `query_plan_convert_join_to_in` with `arrayJoin` JOIN key
- Eliminate redundant joins
- Vector similarity pk partial filter
- Vector Similarity Index Not Used When Additional ORDER BY Column Is Present
- TRUNCATE TABLE leaves partial state after mid-rename crash on MergeTree
- Docs
- C++ not yet supported