clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Fix dateDiff('week')/age('week') undercount crossing the Unix epoch
- Fix toRelativeHourNum non-monotonicity at the Unix epoch
- JSON type: a string value on a dynamic path is re-parsed as a date and stored as different text — `"1"` becomes a timestamp built from the current clock
- Schema inference: a JSON key first seen past the inference sample is silently dropped, and every value under it is lost
- `equals` key analysis casts the tuple constant by name: matching granule pruned
- Incremental refreshable MV to Iceberg silently re-appends all source rows (duplicates) after any external append to the target table
- 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
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