clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- 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
- Transactions for Replicated MergeTree: planned or in progress?
- count() with a whole-tuple comparison against a tuple constant containing NULL counts rows the filter rejects when the key wraps the column in a transform (ORDER BY toString(t))
- Return the normalized headers from HTTPHeaderFilter::checkAndNormalizeHeaders
- Docs
- C++ not yet supported