clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- `system.all_metric_log` reads rotated `wide` metric_log table as all zeros
- Multi-shard DISTINCT with LIMIT silently drops rows on type collapse
- conversionPreservesOrder wrongly accepts Enum8 -> Bool as order-preserving
- `ORDER BY` on a subcolumn bypasses the `Distributed` declared-type order check
- FR: HTTP protocol interface for EXECUTE AS user-impersonation
- LowCardinality WHERE/PREWHERE filters never short-circuit on a constant block, even when the filter column isn't ColumnConst
- Short-circuit LowCardinality WHERE/PREWHERE filters that are constant across a block
- `PREWHERE`-only column breaks `Merge` header match for a `Distributed` child
- Correlated subquery `LIMIT` over `numbers` truncates rows before `WHERE` runs
- LDAP user directory: one in-flight LDAP bind stalls all queries server-wide (storage mutex held across network call)
- Docs
- C++ not yet supported