clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Fix "No set is registered for key" for a subquery used as both FROM source and IN argument
- Add infrastructure for top-K search queries and `vectorSearch` table function with support of the prefiltering
- Logical error 'Unexpected return type from toString' in correlated subquery decorrelation with WITH ROLLUP and group_by_use_nulls
- ALTER TABLE ... ENGINE = ...MergeTree
- Performance: ~7x peak memory for aggregate queries with a PREWHERE filter over wide String columns since 26.2
- text index do not support mapContainsValueLike
- Introduce column source ids and split query tree comparison into local and global
- Parallelize listing of globbed `s3` table function paths
- Add ALTER TABLE ... MODIFY ENGINE to change a MergeTree-family table's engine
- Improve `text` index pruning for multi-block postings
- Docs
- C++ not yet supported