clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Allow attach as replicated for Ordinary databases
- DeltaLake: a `WHERE` on a column whose name contains a dot fails with `DELTA_KERNEL_ERROR` (`Predicate references unknown column`) while selecting it works — the engine predicate passes the raw name and the kernel splits it on dots
- DeltaLake: reading any struct subcolumn (`nest.r`, `tupleElement`) from a partitioned table fails with `UNKNOWN_IDENTIFIER` — the per-file partition transform is pruned with subcolumn names it never outputs; unpartitioned tables and the pre-kernel reader work
- Decode compressed marks on demand
- Columns are not pruned through a VIEW over a Distributed table: SELECT of one column reads every column of the underlying table (analyzer)
- Functions requiring grant
- Iceberg writer: a `Time` column is declared as Iceberg `time` but stored as a bare Parquet INT64 in seconds — spec-compliant readers refuse the table (`Cannot promote long to time`), and the pending `time` read fix (#105540) would misread it by 10^6
- Iceberg TIME column: `WHERE t = <displayed value>` silently returns no rows at default settings (manifest-bounds pruning compares raw microseconds, the projection shows seconds), and an identity partition on the column switches the exposed unit to microseconds (#94686 reproduced upstream)
- Iceberg writer: metadata.json carries `parent-snapshot-id: -1` on root snapshots and lists itself in `metadata-log` (spec deviations)
- CI: report PR changed-line breakdown by src / tests / docs
- Docs
- C++ not yet supported