clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Perfomance issues for mutation on many partitions
- Unexpected result: dictionary with not nullable attribute + OrDefault Null
- Try to find some configs for keeper-client
- Merge table function filesystem. Originally #42039. Originally #50208.
- Idea: CREATE AND RENAME IF EXISTS
- Replicated database engine: don't put IF (NOT) EXISTS queries into the queue when they are no-op.
- Each range costs additional S3::getObject call when reading from DiskEncrypted
- WITH cte AS [NOT] MATERIALIZED (SELECT ...) SELECT * FROM cte
- Do not reload one dictionary multiple time at once
- RENAME + RESTORE Replicated table
- Docs
- C++ not yet supported