clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Introduce Projection Table Expression Modifier
- Reuse query plans for incremental materialized view inserts
- Reject `Nullable(Tuple)` columns in `CREATE TABLE` for `DeltaLake`
- `last_modified` gate bypassed for encrypted disks: write-once reports now()
- feat: structured exception on HTTP and TCP native protocol
- Patch key columns injected without their DEFAULT inputs: lightweight UPDATE invisible
- Filename collision guard dedupes per column, so Tuple-element collisions corrupt data
- 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`
- `toString` claims injectivity for every type: DST fold splits one GROUP BY key
- Docs
- C++ not yet supported