clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Expression merged into join graph by default-ON query_plan_merge_expression_into_join is evaluated on rows the subquery's join excludes: valid query throws at defaults since 26.7
- optimize_redundant_comparisons (default true since 26.7) reasons bytewise about String vs FixedString comparisons: phantom rows and satisfiable conjunctions folded to constant false
- Chain-to-IN rewrites break String vs FixedString padding equivalence: x != c1 AND x != c2 AND x != c3 evaluates true while x != c1 alone is false in the same query
- No per-column diagnostic when the bad row is the last one and the input has no trailing newline
- Fix ALTER protections for nested column groups
- Reject text indexes on multidimensional array columns
- Fix minmax skip index pruning a granule whose Array or Map value contains a NaN
- Fix(S3): Non-strict S3 upload failure handling
- [RFC] ClickHouse GPU v1
- Correlated subquery in HAVING over an aggregating query throws internal code 10 at the ActionsDAG site
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