clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Plan-based parallel replicas: a join with `mergeTreeProjection` throws `NOT_FOUND_COLUMN_IN_BLOCK`
- Plan-based parallel replicas: a query that is not distributed keeps a split aggregation and a `ParallelReplicasSplit` step
- Do not log all mark ranges in `MergeTreePrefetchedReadPool`
- Plan-based parallel replicas: `force_primary_key` throws `INDEX_NOT_USED` on a replica when the filter is a constant above `ARRAY JOIN`
- Plan-based parallel replicas: three plan optimizations are switched off for every query, not only for steps that are shipped
- Read a JSON number into Date and Date32 the same way as toDate
- ORC/Vortex Iceberg INSERT still ignores `iceberg_insert_max_bytes_in_data_file`
- Plan-based parallel replicas: `DISTINCT` and `LIMIT` are not shipped with the plan fragment, so replicas return every row they read
- Fix `INSERT ... SELECT FROM fileCluster` and `urlCluster` failing when the files lack columns with `DEFAULT` expressions
- Hash join compares Float keys bitwise: `-0.0` does not match `0.0`, unlike `=` and the merge joins (NaN keys diverge too)
- Docs
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