clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- OPTIMIZE ... MANIFEST SIGSEGV on an all-deleted Iceberg table
- Support `Nullable(JSON)` in `tupleElement` (nested property access on JSON)
- `optimize_functions_to_subcolumns = 1` can change order of values returned in map[key] (and therefore change result of map[key] = value, for duplicate keys.
- Fix manifest compaction delete all
- Improve canceling queries in DistinctSortedStreamTransform
- `query_plan_convert_any_join_to_semi_or_anti_join` makes a valid correlated `EXISTS` throw `NOT_IMPLEMENTED` under `full_sorting_merge`/`partial_merge`
- Projection-drift guard case (4) misclassifies an ALIAS re-pointed to a late-added column with an expression default over a non-projection column, so the stale projection part is still read/merged
- `optimize_distributed_group_by_sharding_key` returns duplicate unmerged groups for distributed `LEFT JOIN` when a right-table column shares the sharding-key name
- `optimize_skip_unused_shards` breaks column resolution in distributed join: `DISTINCT l.c, r.c + 2` throws `ILLEGAL_TYPE_OF_ARGUMENT` when both sides have a column `c`
- partial_merge executes INNER ANY JOIN with ALL-like left semantics (result differs from hash/full_sorting_merge/grace_hash)
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- C++ not yet supported