clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Distributed plan (`make_distributed_plan`) returns an incorrect top-N for vector search queries
- Fix an error reading an Iceberg table whose `current-snapshot-id` is JSON null
- Iceberg: reading BigQuery-written v2 manifests fails on missing snapshot_id (ICEBERG_SPECIFICATION_VIOLATION), same class as the fixed sequence_number issue
- Lazy Materialization for Joins
- Session setting `allow_archive_path_syntax` re-interprets persisted `::` paths on ATTACH / restart
- GROUP BY / SELECT alias colliding with subquery column name causes false Code: 215 (NOT_AN_AGGREGATE)
- CODEC(Default) on a column ignores the column's type when resolving the table's default codec, silently degrading type-aware codecs
- Apply optimize_functions_to_subcolumns in WHERE/PREWHERE on shards of distributed queries
- RESTORE into a lagging ReplicatedMergeTree replica silently duplicates acked data: the emptiness guard reads local state, not Keeper
- Convert only SEMI JOIN to IN in the convertJoinToIn optimization
- Docs
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