clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- An `Enum` constant nested in a composite `IN`-set member converts to its underlying number, so `IN` matches the wrong row and disagrees with `=`
- A `Dynamic` constant holding an `Enum` is re-emitted to a shard as its bare number: `remote()` reads return the wrong row and diverge from the local plan
- Allow query parameters in ALTER object names
- `clickhouse-test` sheds parallel workers under memory pressure and never restores them, so a run that hovers at the threshold drains to one worker and is killed by the job timeout mid-suite
- Add ClickHouse-style names for the regr_* aggregates
- The `azurite` emulator used by integration tests crashes with a general protection fault in musl
- A torn (zero-byte `data.packed`) packed part in `detached/` wedges the replication queue forever: `ATTACH_PART` throws while probing the candidate's format, before the broken-candidate handling and the fetch fallback
- Correlated subquery over a `Merge` table fails with `Cannot clone ReadFromMerge plan step` when decorrelation duplicates the outer plan (`correlated_subqueries_use_in_memory_buffer = 0`)
- Keep the bucket-order promise of a shard aggregation in the Cascades optimizer
- Perf(String): Avoid copying strings for substring offset 1
- Docs
- C++ not yet supported