clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- DB::Exceptions after Clickhouse upgrade on the server start
- Add format JSONCompactWithoutMetadata
- Trace memory allocation in processors
- system.zookeeper have not any record for auxiliary zookeeper
- ClickHouse uses sipHash128 function for FixedStrings in uniqExact, which can cause 8-5 times grow in state size compared to raw data.
- Clickhouse server in docker stops listening HTTP port if gRPC port is specified
- MaterializedPostgreSQL engine type mapping for uint256
- WITH TOTALS virtual column with total rows size
- Configs added during startup are not detected
- Cannot create Parameterized view when querying a distributed table, cluster() or remote() function when used in a join.
- Docs
- C++ not yet supported