clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- IN (SELECT ...) inside a higher-order-function lambda always evaluates to 0 when the query is a derived table or the lambda is in WHERE
- Failed INSERT INTO s3(...) PARTITION BY leaves a durable read-visible prefix; default hive strategy silently duplicates it on retry
- arrayIntersect overflow guard tests isInteger on a Nullable type, so it never fires
- Column named like an array subcolumn (a.size0) added via ALTER: old parts silently return the subcolumn value instead of the DEFAULT, and merges materialize the wrong values
- Lightweight UPDATE: a mid-commit failure leaves a read-visible partial update and a retry double-applies
- RESTORE: a mid-attach I/O error leaves an un-rolled-back durable data prefix; the suggested allow_non_empty_tables retry duplicates it
- S3Queue (multi-server, hash-ring): a stale per-server Processed cache silently skips a re-appeared object after its tracked-file TTL expires
- PREWHERE Map subcolumn costing performs full-table metadata I/O before pruning
- AST fuzzer: do not create a view that duplicates a non-parallel sink
- Add is_nullable to system.columns, use it in information_schema
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- C++ not yet supported