clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- `GROUPING` masks are wrong for distinct constant expressions in `GROUPING SETS`
- Fix the missing `WITH TOTALS` row of a JOIN whose `ON` is constant false
- Skip 8192-row blocks without a match in the query condition cache for Parquet files
- Return the cached row count of a file as one chunk when only `count()` reads it
- WIP : Experimental IVF method for `vector_similarity` indexes
- Refuse a MODIFY COLUMN default that would leave old parts unsorted by the sorting key
- Keep NULL rows in index analysis of a decreasing function of a `Nullable` key
- Fix wrong results of a Merge read over a Distributed child that lacks a column
- Do not count other outer rows against `max_rows_to_group_by` in a correlated subquery
- Read only the string lengths for length, empty and notEmpty over Parquet files
- Docs
- C++ not yet supported