clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Run apk upgrade in alpine Docker images so base packages get security fixes
- `Merge` + `ORDER BY`: expression on remote child's missing column default-filled
- Legacy `ANY INNER JOIN` wrongly treated as `SEMI JOIN`, hides right-side columns
- Matcher check rejects `tup.*` on a `Tuple` column; persisted row policies break
- Arm: LIKE and position use StringZilla's slower SVE substring kernel on 256-bit SVE CPUs such as Graviton3 (ClickBench q21 -6% with NEON)
- `REPLACE PARTITION` empty-source guard misses source with a 0-row active part
- `additional_result_filter` over a `Tuple` column reorders the result columns, and `tup.a` throws `NOT_FOUND_COLUMN_IN_BLOCK`
- Projection `ORDER BY` tuple with alias is stored as unparseable definition
- Keep aliased tuples in projection `ORDER BY` formatting
- Analyzer-based mutations lose PREWHERE in IN (SELECT ... WHERE ...) set subqueries and build the set twice
- Docs
- C++ not yet supported