clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Patch key columns injected without their DEFAULT inputs: lightweight UPDATE invisible
- Cherry pick #116723 to 26.3: Parallelize Iceberg data manifest decoding
- Cherry pick #116723 to 26.7: Parallelize Iceberg data manifest decoding
- Text index: a part's index substreams are opened and their marks loaded even when the granule reads none of them; deferring that cuts a selective search 50%
- Four optimisations of `T64` decompression
- Filename collision guard dedupes per column, so Tuple-element collisions corrupt data
- Write the empty statistics flag for bucketed Maps in JSON shared data
- Docs: Links contain a duplicated `/docs/` path segment
- Recursive CTE over a remote/Distributed table never converges when the join to the working table is GLOBAL (`prefer_global_in_and_join = 1`): TOO_DEEP_RECURSION
- Merge over Distributed: a constant-folded expression in a joined subquery throws 44 `non constant in source stream but must be constant in result`
- Docs
- C++ not yet supported