clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Incremental refreshable MV to Iceberg: the snapshot-summary cursor has no view/source identity — a second view on the same target (or a re-created source) silently loses all its rows
- ILIKE folds ſ to s only outside the extracted required substring: an unrelated wildcard elsewhere in the pattern flips the same character comparison
- RENAME DATABASE bypasses checkTableCanBeRenamed: ReplicatedMergeTree with a {database}-macro zookeeper_path is silently renamed and comes back readonly
- ReplicatedMergeTree table in a Replicated database cannot load after restart when config has no {shard}/{replica} macros
- Add test: `system.projection_parts` codec: `UNKNOWN` and null-codec branches untested
- 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
- Docs
- C++ not yet supported