clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Correlated EXISTS decorrelates to a CROSS JOIN with severe memory growth when equality columns differ only in nullability
- Build post-hook fails fleet-wide: build-profile INSERT into the CI logs cluster rejected with `MEMORY_LIMIT_EXCEEDED`
- Fix a crash when a spilling join re-enters a HashJoin whose data was released
- Equal JSON values from blocks with different dynamic-path structures are split by hash-based paths: wrong window PARTITION BY at max_threads > 1, grace_hash join silently loses matches
- Table with a user column named a.size0 next to Array column a becomes fully unreadable after ALTER MODIFY COLUMN: AMBIGUOUS_COLUMN_NAME on every SELECT
- Fix data race on totals and extremes of a remote query
- Optimize data lake deletion vector filtering
- Distributed predicate-AST pushdown drops a non-convertible conjunct under NOT, silently losing rows (allow_push_predicate_ast_for_distributed_subqueries)
- WITH FILL INTERPOLATE over a constant ORDER BY column: NUMBER_OF_COLUMNS_DOESNT_MATCH under parallel replicas with optimize_const_name_size = 0
- Reject duplicate storage namespaces within a policy
- Docs
- C++ not yet supported