clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- AMBIGUOUS_IDENTIFIER for a database-qualified Distributed table aliased with the name of another table in a three-way join; unqualified spelling, MergeTree in the same position and the old analyzer work
- Avoid undefined behavior in ctype calls on signed characters
- Perf(Array): Keep binary search for vector needles in indexOfAssumeSorted
- Prune Hive-style partitioned directories during object storage listing
- Native S3 copy sends destination requests through the source client (copyS3File)
- Partition-scoped CLEAR COLUMN is permanently applied to other partitions' Compact parts when a mutation rewrites them (data loss since 26.2)
- Fix DROP TABLE hanging forever after a persisted loop() table has been read
- Establish ZooKeeper sessions single-flight, without holding the global mutex
- Planner: a nested `SETTINGS profile = ...` that enables `use_query_cache` does not opt the subquery into the query result cache
- Named collections drop server/endpoint and session request settings for S3 (s3_* precedence)
- Docs
- C++ not yet supported