clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- 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
- Add test: `vectorFixedConstant` matches-everything shortcut (FixedString column LIKE constant `%`-run) untested
- Make DELETE FROM require only the ALTER DELETE privilege
- ALTER TABLE ... ENGINE = ...MergeTree
- Performance: ~7x peak memory for aggregate queries with a PREWHERE filter over wide String columns since 26.2
- Fix unauthenticated memory-exhaustion DoS in MySQL handshake (length-encoded auth_response)
- Fix DROP TABLE hang for TimeSeries tables in a Replicated database
- text index do not support mapContainsValueLike
- DeltaLake: replace cached snapshot on update() so kernel sees fresh creds
- Docs
- C++ not yet supported