clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Make `SYSTEM SYNC REPLICA` and `OPTIMIZE` of `ReplicatedMergeTree` cancellable while they wait for the replication queue
- Reject `ALTER MODIFY COLUMN` that changes the values of a key subcolumn without changing its type
- [GPU] Use JIT to compile expressions into NVPTX
- Read the CI DB read URL from SSM instead of hardcoding play.clickhouse.com
- Check access to a parameterized view when a query resolves it
- Make `estimateCompressionRatio` estimate `LowCardinality` columns as stored and add a `target_type` parameter for type changes
- Fix rows lost by combined skip indexes when a negated or wrapped `coalesce` comparison is in a disjunction
- Performance comparison: audit of the recent growth of the master_head jobs (long queries, duplicates, amd vs arm)
- Build the default clickhouse-server Docker image FROM scratch
- Rewrite INTERSECT DISTINCT and EXCEPT DISTINCT to JOIN
- Docs
- C++ not yet supported