clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- `constructLocation` Azure branch uses `find("/" + bucket)` which matches inside the URL host — drops container from URL when bucket name is a prefix of the storage-account hostname
- Fix MULTIPLE_EXPRESSIONS_FOR_ALIAS on `SELECT *` over JOIN under parallel replicas
- Analyzer: Compatibility filter push down from HAVING to WHERE
- Fix `UPDATE` with parallel replicas in `MergeTree`
- Cluster mode with `cluster_table_function_split_granularity=BUCKET` poisons the query condition cache by writing 'no match' for row groups assigned to other workers
- Client: keep pasted multi-line query under a single prompt
- Segmentation tokenizer for text index
- ORDER BY aggregate function combinator
- UNIQUE KEY: index cache (7/N)
- UNIQUE KEY: encoder and SST writer primitive (6/N)
- Docs
- C++ not yet supported