clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Make lost folders during Ordinary => Atomic just empty
- query_plan_join_swap_table changes the result of ANY INNER JOIN with OR-ed ON conditions (deterministic, max_threads = 1)
- Reject overlapping PromQL on and grouping labels
- Inlined ALIAS body adds constants to the shipped WITH FILL header; parallel replicas throw
- Do not throw a logical error when an ephemeral node is held by someone else
- Add SHARED REGEXP path placement policy to JSON
- S3Queue: swallowed `after_processing='delete'` failure silently re-ingests files as duplicates
- Join order optimization at default settings builds the hash table from a ~320x-underestimated join intermediate: 64x read amplification on duplicated keys (identical results)
- Refuse Iceberg data compaction until it can publish its result
- Function `resetSerialID` to reset/remove a `generateSerialID` series
- Docs
- C++ not yet supported