clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Insert + select from parquet + array join => Doesn't recognise column names
- Suggestion for improving usability of TTL Group By
- Include initial_user and initial_query_id from initiator replica to other replicas in distributed queries
- UDF with subquery does not working with columns
- max_distributed_connections and distributed_connections_pool_size behavior
- Hung check: Query stuck reading from s3
- [Draft] Not That Trivial Resharding (basic infrastructure)
- fix getMonotonicityForRange() of toDayOfWeek for string arguments
- Add support sql construction `IS DISTINCT FROM (null-safe not equals comparison)`
- [RFC] Use parallel replicas to execute distributed queries without sharding
- Docs
- C++ not yet supported