clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- `setScale` error message uses member variable `scale` instead of parameter `scale_`, showing 0 instead of actual invalid value
- REPLACE PARTITION FROM leaves partial state in destination after mid-rename crash
- Normal projections (ORDER BY) ignore `_row_exists` filter during LWD rebuild because `FetchColumns` stage skips WHERE execution
- DROP DATABASE is not crash-atomic: partial cascade leaves database with some tables removed
- deltaLakeAzure: route through DeltaKernel so time travel, CDF, and schema evolution work
- `HasSystemTablesMatcher` misses system tables in `remote`, `cluster`, `remoteSecure` with quoted names
- `ALTER USER` no-op detection bypassed by `ON CLUSTER` and `IN storage_name` clauses
- Flag `max_replicated_table_num_to_warn`
- <lifetime> does not reload executable_pool UDFs when the underlying script changes
- Proposal: Integrate Blosc2, ZFP, and ZipNN as native compression codecs for numerical arrays
- Docs
- C++ not yet supported