clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- If multiple roles attached to the same user have the same setting override, during connection CH will apply setting from random role
- Test `test_trace_log_memory_context` is flaky
- VIEW WITH DEFINER -> Distributed -> MergeTree does not propagate correct user (propagate initial user instead of definer user for shards)
- Stale info about global in distributed queries in docs
- Refresh materialized view executes on nodes of the original shards when a Replicated DB is created as all replicated
- Failing test 03631_huge_query_filter_analyze
- Insert in Iceberg Rest Catalog DB::Exception: Invalid access: Can not convert empty value. (POCO_EXCEPTION) (version 25.8.4.13 (official build))
- Unexpected restart of ClickHouse Keeper node added to quorum when log index exceeds 100,000
- Iceberg TIME type in ClickHouse returns Int64 seconds instead of microseconds
- Default value and array
- Docs
- C++ not yet supported