clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Parquet: read back the `Nullable(Tuple(...))` files ClickHouse writes, and stop writing broken ones
- [RFC] Sparse vector embeddings for text relevance search
- Abort inside `pthread_mutex_lock` on a data part's `index_mutex` in `IMergeTreeDataPart::getIndexSizeInBytes` (async metrics thread)
- Stream rebuilt projections through bounded writers
- Hedged requests + offset-based parallel replicas silently duplicate a sample segment when the replacement replica connects after the offset already received data
- Make the adaptive timeouts for object storage configurable
- WASM UDF input splitting over-prices `Buffers` batches for `LowCardinality`, `Dynamic` and `Variant`
- Query result cache: evict LRU entries when the cache is full and nothing has expired
- Table with a lambda over a non-deterministic function in the sorting key refuses to load after upgrade; DROP, DETACH and SHOW TABLES on its database all fail
- A pre-26.9 table with an `arrayJoin` CHECK constraint wedges new `Replicated` database replicas readonly and refuses to RESTORE from backup, while plain boot still loads it
- Docs
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