clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Object storage globs read Hive staging and marker paths (_temporary/, .spark-staging-*/): phantom rows and "The specified key does not exist" failures racing writer commits
- aggregate_function_input_format='value' gives phantom state for omitted fields
- Segmentation fault in `StorageDistributed::read` when a scalar subquery over `remote`/`remoteSecure` is evaluated through `InterpreterSelectQuery` (e.g. in a table `CONSTRAINT` during `ATTACH TABLE`)
- Reuse checksum-matching detached parts when bootstrapping a fresh replica
- Reuse context from planning in building query pipeline for StorageMerge
- Segmentation fault (STID: 4085-568b)
- AI functions: add RBAC privileges for executing a function
- Join build side chosen by row estimate alone: 407M-row / 141M-key side hashed instead of 365M-row / 87M-key side, 170 s vs 11 s
- Fix an error reading an Iceberg table whose `current-snapshot-id` is JSON null
- Skip Iceberg compaction on a table with no current snapshot
- Docs
- C++ not yet supported