clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Named collections classed static: `<s3>` endpoint credentials no longer reach them
- Arrow dictionary/Nested reads drop `clickhouse.opaque` tag, corrupting values
- Partitions page: "same data and number of rows" claim is contradicted by the live playground (tables hold different dataset snapshots)
- Roaring Bitmap skip-index
- TID tuple widened to 4 fields breaks system.parts/query_log queries
- SELECT in a transaction issues 4 Keeper ops per in-flight part, was 0
- GROUP BY over a Distributed table whose declared key type differs from the shard type fails with UNKNOWN_AGGREGATED_DATA_VARIANT under two-level aggregation
- Gate clears `subqueries` but not `literals`: hidden WITH alias inlined in IN
- URL table function does not heed input_format_max_block_wait_ms
- Iceberg: expose catalog labels via system.iceberg_labels
- Docs
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