clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Fix partition pruning for a `Tuple` key compared through a cast that changes the comparison
- Parquet reader rejects legacy Arrow null columns with converted_type 24
- Analyzer: GROUP BY, ORDER BY and JOIN analysis re-hash every subquery below each key, so analysis time grows with subquery depth × size
- force_primary_key throws INDEX_NOT_USED for a projection candidate even when the chosen read uses its primary key
- S3 uploads compute full-body SHA-256 payload hash despite PayloadSigningPolicy::Never (bundled aws-sdk-cpp signer ignores the policy)
- Report all skip indices broken by a forbidden column DROP/ALTER
- Fix reading v1 patch parts that both update a column added by `ADD COLUMN`
- Keep lightweight `UPDATE` values in `MATERIALIZE COLUMN` of a column the part does not store
- group_by_use_nulls self-join: one alias's keys read the other alias's column
- HAVING/SELECT/ORDER BY on toYear/dictGet GROUP BY key crashes or drops rows
- Docs
- C++ not yet supported